Consideration of emergency repair projects in the torrential rainstorm of July 2020 that utilised damaged accommodation facilities as shelters

被災宿泊施設を避難所として活用した令和2年7月豪雨での応急補修関連事業に関する考察

土木学会論文集(2023-)


尼崎運河直立護岸での二枚貝の付着を活用した新たな魚礁の開発

尼崎運河直立護岸での二枚貝の付着を活用した新たな魚礁の開発

Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

土木学会論文集B3(海洋開発)


RELATIONSHIP BETWEEN SOLAR RADIATION AND DISTRIBUTION OF INTERTIDAL ORGANISMS ON GENTLY SLOPING REVETMENTS IN THE BRACKISH WATER AREA OF THE YOSHINO RIVER

吉野川汽水域の緩傾斜護岸における日射と潮間帯生物の分布の関係について

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)

土木学会論文集B2(海岸工学)


東日本大震災後の連続災害による在宅被災者の困窮過程と支援に関する調査研究 -南海トラフ巨大地震未災地で教訓とするために-


Efficient probabilistic prediction of tsunami inundation considering random tsunami sources and the failure probability of seawalls

Stochastic Environmental Research and Risk Assessment


Probabilistic tsunami hazard assessment based on the Gutenberg Richter law in eastern Shikoku


EXPERIMENTAL CONSIDERATION ON GATHERING EFFECT OF FLOORSPLACED TO FLOATING FISH REEFS FOR TARGETED TRIDENTIGER OBSCURUS IN HYPOXIA ENVIRONMENT

貧酸素環境中のハゼ科チチブを対象にした浮体型魚礁に設けた床の蝟集効果に関する実験的考察

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)

土木学会論文集G(環境)


CHARACTERISTICS OF CARBON FLOW ON PELAGIC ECOSYSTEMS AT HYPERNUTRIENT AREA IN AMAGASAKI CANAL

過栄養 域の尼崎運河における浮遊生態系の炭素フローの特性

土木学会論文集B2(海岸工学)


DEVELOPMENT OF A PROBABILISTIC TSUNAMI HAZARD ASSESSMENT METHOD (CORAL METHOD) AND ITS APPLICATION TO TSUNAMI INUNDATION ASSESSMENT

確率論的津波ハザード評価手法(coRaL法)の構築とそれによる津波浸水評価

土木学会論文集B2(海岸工学)


DISCUSSION ON THE RELATIONSHIP BETWEEN CORAL DISTRIBUTION CHARACTERISTICS AND THE PHYSICAL ENVIRONMENT IN HOLLOW CUBE BLOCK TYPE ARTIFICIAL REEF

中空ブロック型人工リーフでのサンゴ分布特性と物理環境要因の関係に関する考察

土木学会論文集B2(海岸工学)


A comparative method for evaluating ecosystem services from the viewpoint of public works


Comparison of response of coastal forests to seawater immersion by storm surge with reference to tree species

高潮による海水浸漬を受けた海岸林における樹種別の応答の比較

In this study, to evaluate the tolerance of broadleaf trees in coastal forests to the coastal environment, the damage of component tree species was investigated on the Osato Matsubara coast in Tokushima Prefecture, Japan, which was immersed in seawater by a storm surge. The survey was conducted on 842 trees of nine species that were recorded from an area of 1.35 ha, and their planting locations and survival were examined. Based on the results, when comparing survival rates among tree species located at similar altitudes, the deciduous broadleaf trees Celtis sinensis and Zelkova serrata showed survival rates of more than 89%, which was significantly higher than that of Pinus thunbergii at approximately 38%. The survival rates of evergreen broadleaf trees, such as Cinnamomum camphora and Morella rubra, were approximately the same as that of P. thunbergii.

本研究では，広葉樹の海岸環境への耐性を評価するため，高潮による海水浸漬を受けた徳島県大里松原海岸の海岸林で構成樹種の被害状況を調べた．調査は1.35 haの範囲に出現した9種842本の樹木を対象に，出現位置や生死を調べた．その結果，同程度の標高に位置する樹種間で生存割合を比較すると，落葉広葉樹のエノキとケヤキは8割以上を示し，クロマツの4割に比べて顕著に高かった．常緑広葉樹のクスノキとヤマモモは落葉した後に，胴吹きなどによって回復した個体を含めると，クロマツと同程度の生存割合を示した．

Journal of the Japanese Society of Revegetation Technology


Green port structures and their ecosystem services in highly urbanized Japanese bays


Spatial and temporal distribution of carbon dioxide flux in Amagasaki Canal, Japan


Discussion on Designing and Assessing Disaster Prevention Education based on ID Focusing on the Leading Evacuees Drills Using Red/Blue paperboard

IDに基づく防災教育の設計•評価に関する一考察-青赤紙を用いた率先避難訓練を事例に-

Based on the example of a disaster preparedness education program implemented by the authors, leading evacuees drills using red/blue paperboard, this study examined the problems of the program and their remedial measures for improving disaster preparedness education. As a result, the following two problems were identified: 1) the focus was on the teaching strategies, such as methods for teaching the roles of leading evacuees, and learner analysis for setting the goals and the assessment criteria was not fully conducted, 2) there might have been a gap between what the instructors wanted to teach and what the learners understood due to the fact that the program was implemented without setting clear goals and assessment criteria. Based on a specific example of disaster preparedness education, it was demonstrated that in order to improve disaster preparedness education, it is important to present remedial measures for the problems of the program using instructional design (ID) and to design the education program in the order of goals, assessment criteria, and finally teaching strategies.

本研究では筆者らが行った「青赤紙を用いた率先避難訓練」の防災教育を事例に，よりよい防災教育へ改善していくための問題点と，その改善策を検討した．その結果，本事例の問題点として(1)率先避難者の役割をどのように教えるのかといった「教授方略」に注力し，「目標」や「評価」を決めるための学習者分析を十分に行わなかったこと，(2)「目標」や「評価」をあいまいなままに教育を行ったことで，学習者が理解したことと教育者が教えたいことにズレがあった可能性を見出すことができた．インストラクショナルデザイン(以下ID)を用いることでこの問題点の改善策を提示し，「目標」⇒「評価」⇒「教授方略」の順番で教育を設計することが，よりよい防災教育へ改善していくために重要であることを，防災教育の具体的事例に基づき示すことができた．

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)

土木学会論文集B2(海岸工学)


チチブの栄養段階に着目した尼崎運河の改善方法に関する提案

チチブの栄養段階に着目した尼崎運河の改善方法に関する提案

土木学会論文集G(環境)


ANALYSIS OF SROI FOR ENVIRONMENTAL IMPROVEMENT ACTIVITIES IN AMAGASAKI CANAL AND EXAMINATION OF ITS FLUCTUATION RANGE

尼崎運河における環境改善への取り組みのSROI評価とその変動幅の検討

土木学会論文集G(環境)


EVALUATION ANALYSIS OF DAILY USE VALUE OF EVACUATION FACILITIES BASED ON COMPARISON BETWEEN DISASTER-PREVENTION PARK AND EVACUATION HILL

防災公園と避難高台の比較に基づく津波避難施設の日常利用価値の評価分析

土木学会論文集B2(海岸工学)


尼崎運河でのハゼ科チチブの人工魚礁創出実験

尼崎運河でのハゼ科チチブの人工魚礁創出実験

Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

土木学会論文集B3(海洋開発)


An effect and influence factor by the VR experience for subject of coastal environment

沿岸域環境を主題としたVR体験による効果とその影響因子


アミノ酸を含有したコンクリート用被膜養生剤の海水中での付着微細藻類増殖効果に関する研究


NUMERICAL SIMULATION OF LARVAL DISPERSAL OF BENTHOS IN AND AROUND THE TAMA RIVER ESTUARY

多摩川河口域における干潟底生生物の幼生分散数値シミュレーション

The behavior of planktonic larvae in the Tama River estuary and Tokyo Bay was examined by a larval dispersal model developed in this study for the estuarine bivalve Corbicula japonica and the estuarine crab Chiromantes dehaani larvae. In the model for C. japonica larvae, the vertical movement due to the preferred salinity and the water temperature and/or salinity dependent mortality rates and others were taken into account. For C. dehaani larvae, the effects of the diurnal vertical movement under the influence of hypoxic bottom water and the water temperature dependent mortality rate and others were modeled. The numerical simulation output was confirmed to reasonably well reproduce the spatial distribution patterns of the relative larval population density and the fractional age ratios of larvae found in the field survey.

本研究では，東京湾多摩川の河口干潟に豊富に生息しているヤマトシジミおよびクロベンケイガニを対象とした幼生分散モデルを構築することにより，多摩川河口域ならびに東京湾でのこれらの浮遊幼生の分散挙動について検討した．ヤマトシジミ幼生に関する幼生分散モデルでは，好適塩分に対する鉛直移動特性および水温・塩分依存型死滅率等をモデル化した．クロベンケイガニ幼生に関しては，底層での貧酸素水塊を考慮した鉛直日周移動および水温依存型死滅率等をモデル化した．その結果，現地調査結果におけるこれらの幼生の相対個体数密度および相対幼齢比率の分布特性を再現することができた．

土木学会論文集B2(海岸工学)


干潟健全度指数を用いた大阪湾の干潟のサービスの定量化 -東京湾と大阪湾の比較による干潟のサービスの特徴の把握

土木学会論文集B2(海岸工学)


津波避難経路の安全性向上のためのブロック塀対策の取り組みと課題について

津波避難経路の安全性向上のためのブロック塀対策の取り組みと課題について

土木学会論文集B2(海岸工学)


近年の吉野川河口干潟の地形変動とルイスハンミョウ生息地の変化について

近年の吉野川河口干潟の地形変動とルイスハンミョウ生息地の変化について

土木学会論文集B2(海岸工学)


Deep learning effect of Active Learning on environmental education program for elementary school children in Amagasaki Canal

小学生を対象とした尼崎運河におけるアクティブラーニング型環境学習の試行と深い学びに関する考察


THE STUDY OF HABITAT CREATION FOR ENDANGERED SPECIES ON ARTIFICIAL SHORE

沖洲人工海浜での希少種ルイスハンミョウ保全のための生息環境創出実験

We conducted experiments to clarify the method of the creation and the maintaining of habitat for larvae of an endangered tiger beetle on a artifical sandy shore. The experimental area was created to clear the three habitat conditions of larvae in the previous study. We analyzed the seasonal change of the elevation, vegetation and sediment stability of habitat. We found that the following two factors of unsuitability for the habitat on experimental locations. 1)The low elevation and the high frequency of sediment erosion on the sea side. 2)The high elevation and high vegetation on the land side. In addition, the beach torography has affected them. We were able to create suitable habitat for larvae through this study. However, these habitats are maintained only for about three years due to vegetation growth and sedimenntation. Therefore, it is necessary to maintain and manage continuously.

我々は，代償措置によって創出された徳島県沖洲地区の人工海浜において，希少種ルイスハンミョウ幼虫の生息環境を創出し，維持管理する方法を解明することを目的に実験を行った．実験区は，これまでに明らかになっている幼虫の生息環境条件を満たすように創出し，幼虫生息標高場の面積や植生被度の季節変化，地盤変動のしやすさを解析した．その結果，実験区が幼虫生息不適地となった要因を，(1)海側で土壌浸食をうけること，(2)陸側で植生被度が高くなることの二つに大別でき，海浜地形が影響していることがわかった．本研究により幼虫の生息適地を創出することができた，しかし植生の繁茂や砂の堆積などによりその生息場は約3年しか維持されないことから，人為的な維持管理を継続的に行っていく必要も明らかとなった．

土木学会論文集B2(海岸工学)


Environmental effect on ecosystem and water quality improvement ability of a small channel by Environmentally Active Concrete in Amagasaki Canal

尼崎運河での環境活性コンクリートによる生物浄化水路への効果

The environmental effects of the environmentally Active Concrete (AC) were evaluated by a field experiment in Amaga-saki Canal. We focused on a difference of ecosystem response and water quality improvement ability between AC and ordinary concrete (OC). The experiment conducted in a small water channel facility in Amagasaki Canal and a U-shaped gutter that contained L-arginine were set up on the channel. We applied the AC contains L-arginine 3% ratio by weight. As a result, the primary production of Algae was increased to 130% with AC, and twice the number of benthos could be alimented by AC more than OC. The elimination quantity of nitrogen from the seawater increased by AC corresponding to the primary productivity difference between AC and OC.

富栄養化した汽水域における環境活性コンクリートの生物相と水質浄化に対する効果を評価した．尼崎運河を研究対象地とし，尼崎運河水質浄化施設内の水質浄化機能向上のため，掛け流し式小水路にU字型の環境活性コンクリート(以下AC)を設置した．本研究ではコンクリートにアミノ酸の一種であるL-アルギニンを重量比で3%混和させたACを使用した．現地実験と室内実験より，生物相への効果としてはAC表面に繁茂した付着藻類量は普通コンクリート(以下OC)よりも約1.3倍多かった．また約2倍のベントス類が蝟集され，"扶養"しうるベントス量を増加させうることがわかった．水質浄化量も藻類の増加に対応して増加することがわかった．

土木学会論文集B2(海岸工学)


The educational effect of new disaster-prevention activity using a tsunami inundation depth sticker in Tuda and Shinhama, Tokushima City, Pref. Tokushima

徳島市津田・新浜地区での中学生との想定津波浸水深表示シールの貼付とその啓発効果

We visited houses and stores with Tsuda junior high school students and requested to put a tsunami inundation depth sticker developed by ourselves. We could cooperate with more than 80 percent of 108 people. Effect of the stickers was investigated by the KM-Map method for the guardians of Tsuda junior high school and found that many people did not take the conventional process of “action after understanding” but took the reversal process of “understanding after action”. This feature was analyzed using the questionnaire results, which indicates that those who took the reversal process tend to feel responsible for the students. In other words, regional disaster prevention activity of Tsuda junior high school students seems to enhance disaster prevention measure of the residents in the community.

著者らが考案した安価でかつ簡単に設置できる想定津波浸水深表示シールの貼付を，津田中学生と一緒に徳島市津田・新浜地区内の住宅や店舗を訪問し，依頼したところ，8割以上の方々(108人)に協力頂けた．津田中学校保護者を対象に，津波シールの啓発効果をCAUSEモデル法で評価した結果，「リスク・行動の理解」に加え「行動を進める」効果もあることがわかった．同様に，著者らが考案したKMマップ法でも評価したところ，従来のリスクの「理解」→「行動」への過程でない，「行動」の後に「理解」を深める人(とりあえず"やっておこう")が多いことがわかった．この"やっておこう"という人の特徴をアンケート結果から解析すると，「中学生に対する責任」を強く感じていることが示唆された．つまり，津田中学生の地域防災活動が，当地区の住民の防災対策を促しているようである．

土木学会論文集B2(海岸工学)


NUMERICAL STUDY ON VARIABILITY OF TSUNAMI INUNDATION PROCESS INDUCED BY A GROUND LIQ-UEFACTION IN TOKUSHIMA CITY

液状化に伴う沈下を考慮した徳島県東部での津波浸水過程の数値的検討

A tsunami simulation with a ground liquefaction was conducted for the evaluation of an effect on the variability of the tsunami inundation process caused by the ground deformation. We developed a new correction method to calculate a change of ground elevation by a ground liquefaction using the result of the simplified method and the result of FEM by FLIP. The tsunami simulation was conducted by JAGRUS. As a result, the inundation process and the arrival time of Tsunami were changed by a ground liquefaction around small rivers and banking structures because the tsunami runs up through small rivers and is trapped by roads and rail tracks. There were areas where the arrival time of the tsunami reached at most 10 minutes earlier. The numerical results suggested that ground conditions could change the tsunami prediction result drastically and we should start to escape disaster as soon as possible.

徳島市を対象に，液状化による地盤沈下を考慮した津波浸水計算を行い，液状化による津波浸水過程への影響を評価した．地盤沈下量は，中央防災会議による予測結果を有限要素解析(FLIP)の結果を用いて補足することで求めた．津波浸水予測にはJAGRUSを用いた．その結果，津波の浸水過程と到達時刻は，液状化による沈下を考慮した場合，内陸に向かう小河川の近くや，道路や鉄道線路といった人工地形の周辺で変化した．このような浸水過程の変動特性を有する場所では，津波到達時刻が最大で10分程度早まることもあった．これは特定の条件下での解析結果であるため，可能性の一つではあるが早期避難の重要性を改めて示す結果である．

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)

土木学会論文集B2(海岸工学)


THE CREATION AND MANAGEMENT OF HABITAT FOR AN ENDANGERED TIGER BEETLE IN A CREATED SANDY SHORE

希少種保全を目的とした人工海浜の整備について

In this study, the creation and management of habitat for the endangered tiger beetle were examined in a sandy shore created for the purpose of habitat mitigation. We found that the following two important factors for its habitat. 1) The elevation of habitat for larvae: Its absolute value varied spatially. However, its relative value was similar among different sites and it would be suggested that the flooding time is related to that elevation. 2) The area with stable elevation suitable for larval habitats: A lot of adults were occurred in the year when that area was large. We propose that we should create and manage the area with stable elevation suitable for larval habitats as large as possible in the shore.

本研究は，希少種ルイスハンミョウの生息環境を代償するため造成された沖洲人工海浜において，生息地創出条件を明らかにすることを目的としている．そこで，徳島県を含む4県において幼虫の生息標高の調査と，徳島県吉野川河口干潟の成虫個体数と幼虫にとって好適である「地盤高が安定している場所」の面積との関係を調査した．その結果，幼虫が生息する標高は地域によって異なるが，その制限要因として冠水時間が関係していると考えられた．また，「幼虫にとって好適な場」の面積が大きい年に，成虫が多く確認されることが分かった．以上のことから，ルイスハンミョウの生息地の創出条件として，幼虫にとって好適な場所を広く確保することを提案する．

Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

土木学会論文集B3(海洋開発)


APPLICABILITY OF MODIFIED SOIL MADE OF DREDGED SOIL AND PAPER SLIDGE ASH AS VEGETATION SOIL OF WATERSIDE

PS灰改質材を用いて改質した浚渫土の水域の植物生育基盤への適用性

Recently, shallow place as habitat is constructed by use of dredged soil. In this case, dredged soil is often added modified material in order to increase strength and workability. This modified soil is required to be safe and applicable for habitat. Hence, this study aims to use modified soil, that made of dredged soil and paper sludge ash, as vegetation soil of waterside. By plant test under fresh water condition and seawater condition, strength and pH of modified soil and number and hight of the test plants has been checked. As a result, modified soil has shown applicability as vegetation soil of waterside.

近年，浚渫土を浅場造成の材料として活用し，生物の生育地を整備する事例が見られる．この際，浚渫土は強度増加や施工性向上のために改質材を添加，混合して改質土とすることがあり，改質土には生物生育地としての安全性や適用性が求められる．そこで本研究では，浚渫土に製紙汚泥焼却灰を原料とする改質材を添加，混合した改質土を植物生育基盤へ有効利用することを目的として，淡水条件及び海水条件での植栽試験をおこない，供試土壌の強度，pH変化，および，供試植物の地上部の本数と草丈を調査した．その結果，改質土が植物生育基盤として適用可能であることがわかった．

土木学会論文集B3(海洋開発)


Educational Effect on Nature Experience Activity Held in Tidal Flats for University students -From the Viewpoint of Active Learning

大学生を対象とした干潟での自然体験学習に関する考察 ∼アクティブラーニングの視点から∼


DEVELOPMENT OF INTEGRETED ENVIRONMENTAL IMPACT ASSESSMENT MODEL AND ITS APPLICATION TO TAMA RIVER ESTUARY AROUND HANEDA AIRPORT

統合型海域環境影響評価モデルの構築と 多摩川河口・羽田空港周辺海域への適用

土木学会論文集B2(海岸工学)


ENVIRONMENTAL FUNCTION OF NEW BIOLOGICAL PURIFICATION FACILITY IN AMAGASAKI CANAL FROM THE PERSPECTIVE OF WATER PURIFICATION AND ECOSYSTEM SERVICES

尼崎運河水質浄化施設の水質浄化機能と生態系サービスの評価

土木学会論文集B2(海岸工学)


Evaluation of the Positive Ripple Effects of Decadal Disaster Prevention Education in Tsuda Junior High School

徳島市立津田中学校での10年間の 防災学習・活動とその地域波及効果

土木学会論文集B2(海岸工学)


APPLICATION OF FORECASTING METHOD FOR BENTHIC COMMUNITY AFTER FLOOD IN AN ESTARINE TIDAL FLAT

河口干潟における洪水後の底生生物群集の予測方法の適用性について

土木学会論文集B3(海洋開発)


EFFECTS OF SILT AND CLAY CONTENT IN SEDIMENTS ON A "SINKING EVENT" AT AN ARTIFICIAL TIDAL FLAT IN OKINOSU, TOKUSHIMA CITY

底質中のシルト・クレイが徳島市沖洲人工干潟における「沈み込み現象」に与える影響

土木学会論文集B3(海洋開発)


Developing and Evaluating a Learning Program for Junior High Schools Regarding Pre-disaster Improvement Planning for Post-Disaster Recovery

事前復興まちづくり計画に関する中学校用学習プログラムの開発とその評価

In this research, junior high school students were given lessons on pre-disaster improvement planning for post-disaster recovery a total of eight times (12 hours). (1) Among the learning target items, the highest degree of achievement was for "Learning about the damage in my town." In the future, it will be necessary to create a wider range of educational materials related to the social circumstances that followed the Great East Japan Earthquake. (2) The majority of students discussed what they learned with family members, friends, and acquaintances. If a common awareness can be created in advance in this manner, it will be very effective in formulating pre-disaster improvement plans while making actual efforts for consensus building. (3) It was possible to demonstrate that this program is an education for sustainable development learning (ESD) method.

土木学会論文集B2(海岸工学)


Impact assessment and estimation of hydrogen sulfide concentration in the shallow waters on Ruditapes philippinarum inhabiting

アサリの生息する極浅い水深帯での硫化水素濃度の推定とその影響

We investigated occurrence of blue tide in the field and experimented the effects of blue tide to Ruditapes philippinarum in the laboratory. Blue tide occurred several times each year on Omaemaha in inner part of Osaka Bay. Occurrence of blue tide corresponded weather condition. It could develop the relationship between ORP and pH in the field and estimate concentration of hydrogen sulfide in D.L. -1m inhabiting R. philippinarum. It was not recognized unequivocal effects of hydrogen sulfide to mortality rate of R. philippinarum under reductive environments. On the other hand, clearance rate of R. philippinarum was affected by hydrogen sulfide and did not recover early time.

土木学会論文集B2(海岸工学)


Problems and Measures for Formulation of Preliminary Reconstruction and

持続の危ぶまれる地域での住民主体による事前復興まちづくり計画の立案初動期の課題と対策

The objectives of this study was clarified problems and measures for formulation of preliminary reconstruction and urban development plan by residents in Minami Town, Pref. Tokushima. The results of the study are as follows; (1) We established three areas autonomous disaster prevention organizations in Yuki. (2) Residents not only measures for disaster prevention and disaster reduction but preliminary reconstruction and urban development were proposed by heard about disaster victims' actual experiences and participated in a study session. (3) We were able to extract residents' local inheritance motivation is not high and residents' reconstruction motivation is high in Yuki by hearing investigation.

事前復興計画とまちづくり計画とを合わせた，事前復興まちづくり計画を提案し，実際に美波町由岐湾内地区での，事前復興まちづくり計画策定の可能性について調査，考察を行った．由岐湾内3地区自主防災会を立ち上げ，事前復興まちづくり計画の策定に関する勉強会を重ねる中で，参加住民の意見は徐々に変化し，避難という津波に対する減災意識から，復興というまちの持続性に対する関心が芽生えていった．当地区での住民意識調査を行い，事前復興まちづくり計画の核を抽出することができた．また，南海地震が発生した場合，由岐に残って復興する住民が約7割おり，事前復興まちづくりに対する当地区の住民に潜在する意欲は高いことがわかった．


Development of suspended substance removal technique using attached bivalves in Amagasaki Canal

尼崎運河での優占二枚貝を活用した水中懸濁物除去手法の開発

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)

土木学会論文集B2(海岸工学)


DIN Fixation by Macroalgae and Release from Sediment by the Burrowing Macrophthalmus japonicus

ヤマトオサガニの造巣活動に伴う底質から水中へのDIN回帰と藻類による固定

The relationship burrows of Macrophthalmus japonica and utilization DIN by microphytobenthos in river mouth tidal flat was evaluated. Seasonal variation and temporal variation about DIN for one tide were investigated in the crab burrows. Though dissolved oxygen decreased during ebb tide for respiration by crab and organic decomposition, NH4+-N in the burrows increased for metabolism by crab and elution from wall surface. Burrows supplied DIN for tidal flat area in flood tide and microphytobenthos efficiently assimilated DIN. It found that burrows served DIN for microphytobenthos as fertilizer application.

土木学会論文集B2(海岸工学)


THE ECOLOGICAL FUNCTION OF MUD SNAIL BATILLARIA CUMINGII AS AN ECOSYSTEM ENGINEER.

生態系エンジニアとしてのホソウミニナの役割

Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

土木学会論文集B3(海洋開発)


Experimental Consideration of the effects of Hydrogen Sulfide on Ruditapes philippinarum

アサリに及ぼす硫化水素の影響に関する実験的考察

土木学会論文集B2(海岸工学)


A predictive model of benthic community to sediment in tidal flat of river mouth

干潟の底質環境に対する底生生物群集予測モデルの提案

A simple model forecasting benthic community structure in estuarine tidal flats based on physical characteristics of sediment was proposed in this study. Monitoring data of the investigations conducted by Tokushima Prefecture in the Yoshino River was used to develop the present simple model. Physical characteristics of sediment such as particle size and difference in elevation were selected as the major factors forecasting benthic community structure. Relationships between physical characteristics of sediment and benthic community structure from the data for 5 years seemed to be enough for developing the simple model. Silt-clay content of sediment and difference in elevation could be classified into 5 to 6 groups in the present simple model. Those groups were also characterized by several specific benthic species. It meant that benthic community corresponded to sediment characteristics in the tidal flat. The integrated prediction accuracy of the model was 71 % at the maximum. It needed to compile for the monitoring data to develop the simple model at least 2 years judged from prediction accuracy.

本研究では，徳島県吉野川河口干潟において，物理環境の変化に対する生物群集の応答を示すことができる簡便で，実用性の高い底質環境・生物群集対応モデルを提案した．まず，粒度組成と地盤高さといった予測可能な限られた物理的指標を用いて，底質環境と底生生物群集の対応モデルを作成した．底質環境・生物群集対応モデルは年を重ねるごとに新たなデータを追加して作成し，5ヵ年の底質環境，底生生物データから底質環境・生物群集対応関係の精度を高めていった．底質環境による調査地点のグループ分けは，まずシルト・クレイ率のデータに地盤高さを加えることで論理的かつ簡便にグループをまとめられ，各グループは底質環境に対応した異なった底生生物群集であることがわかった．シルト・クレイ率と地盤高さという予測可能な2つの物理的な底質環境項目からモデルを用いて再現性の検証を行った結果，実際の調査結果との一致率は最大7割であった．再現性に及ぼすモデル作成時に用いるデータ量の影響について，本河口干潟では底質環境・生物群集モデルは少なくとも2年分のデータがあれば5年分のデータで得られた予測精度と大きくは変わらなかった．また，予測と実際の調査結果が一致しなかった地点については過去の底質環境の変動パターンから底生生物群集の変化を考察した結果，底生生物群集が変化途中であると示唆され，底質環境の変化に伴う底生生物群集の応答時間スケールの解明が課題点として明らかになった．


Values and Applications of Earthquake and Tsunami Stone Monuments in Tokushima

徳島県における地震・津波碑の価値と活用について

We examined values and applications of earthquake and tsunami stone monuments in Tokushima. The results of the study are as follows; (1) the purposes of stone utilization were to hand down records and lessons of earthquake and tsunami to posterity for its "presence", "conspicuousness" and "durability". (2) We recognized three cultural values of earthquake and tsunami stone monuments in Tokushima such as academic material, disaster prevention education material and disaster cultural asset. (3) We found that about 70% of earthquake and tsunami stone monuments in Tokushima have problems of their location and decipherment, and "teaching" function decreased remarkably. On the other hand, some stone monuments signs of their locations and/or explanations in modern Japanese were newly set up. (4) We collected the application cases of the earthquake and tsunami stone monuments in local municipals, areas and primary and junior high schools.

土木学会論文集B2(海岸工学)


Study on Filter-Feeding Disability of Ruditapes philippinarum by Hypoxic Water

貧酸素によるアサリのろ水機能への後遺障害に関する研究

This study was conducted monthly investigation of R. philippinarum density along with measurement of DO, temperature and salinity in Omaehama beach from 2006 to 2008. Filtered function and recovery process of R. philippinarum were measured in hypoxic and anoxic condition. R. philippinarum which exposed by hypoxia and anoxic water was put in the sufficient oxygen water and feeding activity was measured every few days. It is revealed that hypoxic water decreased a filtered function of R, philippinarum for a long term. In the anoxic water, the number of R. philippinarum dying increased and filter-feeding activity never recovered. Consequently, it indicated that filter-feeding activity of R. philippinarum could not be expected even though it would survive in hypoxic and anoxic water

土木学会論文集B2(海岸工学)


The ZOSTERA MARINA Beds Creation with Detached Breakwater

Journal of Recent Advances in Marine Sciences and Technology 2010


Biomass Resources from Mussels Attached to the Vertical Breakwater at Osaka Bay


尼崎運河における水質汚濁と水環境再生を主題とした環境教育の波及効果

尼崎運河における水質汚濁と水環境再生を主題とした環境教育の波及効果


吉野川河口干潟における二潮汐間での干潟底生微細藻類群集の変動特性

吉野川河口干潟における二潮汐間での干潟底生微細藻類群集の変動特性


過栄養化内湾でのワカメの自立的な世代交代を可能とさせる繊維材料に関する研究

過栄養化内湾でのワカメの自立的な世代交代を可能とさせる繊維材料に関する研究

Proceedings of Civil Engineering in the Ocean


アミノ酸混和コンクリート表面上での付着微細藻類の生長特性に関する研究

アミノ酸混和コンクリート表面上での付着微細藻類の生長特性に関する研究


Economic Evaluation of the Ecological Breakwater at Mishima-Kawanoe Port by CVM and FSM Method

The ecological breakwater constructed at Mishima-Kawanoe Port in Ehime Prefecture in 2005. This study presents results of questionnaire surveys using Contingent Valuation Method (CVM) and Fuzzy Structural Modeling (FSM) method relevant to Willingness to pay (WTP) of Eco-breakwater. The structure of the various effects of Eco-breakwater is established by FSM method, which is an equation of calculating the total WTP of various effects by eliminating double counts. The B/C ratio is calculated as more than 7.0 by using CVM and FSM method, showing social significance on installation of Eco-breakwater.

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)


Tsunami evacuation at the 1854 Ansei and the 1946 Syowa Nankai earthquake

We examined tsunami evacuation at the 1854 Ansei and the 1946 Syowa Nankai earthquake and considered factors to urge early tsunami evacuation. The results of the study are as follows; (1) There was a problem in tsunami evacuation because 60 percent or more of the deceased person originated in the tsunami at the 1854 Ansei and 1946 Syowa Nankai earthquake. (2) There were a lot of people who evacuate early from the tsunami at the 1854 Ansei Nankai earthquake because they experienced in "small tsunami" at the 1854 Ansei Toukai earthquake. (3) Inhabitants were able to decrease deceased persons because they had evacuated early from the Syowa Nankai earthquake tsunami. In addition, a factor to urge early tsunami evacuation they knew legends that concretely urge evacuation from tsunami.


On the Composition for mussel, Mytilus galloprovincialis, Association and the Dropout Process

The invasive mussel dominates the vertical seawall structure which composes much of the coast. A large volume of oxygen is consumed after dropping the mussels themselves to the bottom during the summer period. In this research, it was suggested the inhabiting situation at inside of the mussels association. The inside association was composed by young shells. They are less 20 mm of body size. The obesity rate is lower and the mortality rate is higher than the outside. The cause of dropout was considered for constructing the multi layered mussels on the seawall. The inside of association becomes heavy condition for living. With the changes in temperature and salinity, some individuals at inside association decrease adhesive to the seawall, and drop out with the integrated living mussels.


徳島大学での地震避難訓練と学生・教職員の防災意識

徳島大学での地震避難訓練と学生・教職員の防災意識


大阪湾湾奥に造成された人工海浜の底生生物に及ぼす貧酸素化・青潮の影響

大阪湾湾奥に造成された人工海浜の底生生物に及ぼす貧酸素化・青潮の影響

Proceedings of Coastal Engineering, JSCE


瀬戸内海における津波の波動特性とその危険度の時空間解析

瀬戸内海における津波の波動特性とその危険度の時空間解析


ヤマトオサガニの造巣活動に伴う物理的生物撹拌作用の定量評価

ヤマトオサガニの造巣活動に伴う物理的生物撹拌作用の定量評価


尼崎運河における護岸付帯式浅場を用いた砂浜性二枚貝の生息空間創出に関する現地実験


Depositional role of mussels (Mytilus galloprovincialis) attached to quaywalls in Amagasaki port, Osaka Bay

尼崎港内の懸濁物質の沈降特性に及ぼすムラサキイガイの影響


1 A study on the numerical simulation of the seashell-digging human action in a seaside park by Multi-Agent Model : Model for UMINOKOUEN

マルチエージェントモデルによる潮干狩り行動の数値シミュレーションに関する研究ー「海の公園」における数値モデルー

When we use ocean space for human activities, we should consider sustainability and allowable human impacts. After the 1960 's, we have lost 90 percent or more of the tideland of Tokyo-bay by the reclamation. "Uminokouen" is one of the artificial seashore parks developed in 1988 at the southeast of Yokohama and is well known as a relaxation place for the citizens. Over 20,000 people visit there for seashell-digging (SHIO-HIGARI) in a holiday in the spring. It is easy to understand that the human impact is quite large to an ecosystem of living bivalves in the park. Actually, the most part of living bivalves which are grew up after the last summer or autumn disappeared during the season. In this paper, we propose a computational model which predicts the human action of seashell-digging at this park using a multi-agent-algorithm. Comparing the simulation result with the actual data, the staying time of the visitors agrees well. Then, we investigate the relation among the initial spatial distributions of the bivalves, the spatial distributions of the amount of the caught short-neck clam and the trace of the visitors. Then we predict the human impact in the best weekend for the seashell-digging and examine the sustainability of the relaxation park.

Journal of the Japan Society of Naval Architects and Ocean Engineers

日本船舶海洋工学会論文集


わが国における大学防災の現状に関する調査研究

わが国における大学防災の現状に関する調査研究


徳島県沿岸海域における安政南海地震津波(1854)の流動特性の再現

徳島県沿岸海域における安政南海地震津波(1854)の流動特性の再現


徳島県鳴門市周辺における安政南海地震の震度分布

徳島県鳴門市周辺における安政南海地震の震度分布


中国・黄河から渤海に流入する高濁度水塊の挙動特性に及ぼす潮流及び風応力の影響

中国・黄河から渤海に流入する高濁度水塊の挙動特性に及ぼす潮流及び風応力の影響


大規模閉鎖性水域の渤海における流動構造の季節変動特性

大規模閉鎖性水域の渤海における流動構造の季節変動特性


優占二枚貝を考慮した汽水湖の水質変動解析

優占二枚貝を考慮した汽水湖の水質変動解析


成層の発達した海峡の流動構造と内部波の発生機構

成層の発達した海峡の流動構造と内部波の発生機構

Annual Journal of Hydraulic Engineering. JSCE


紀淡海峡における残差流と物質輸送の現地観測

紀淡海峡における残差流と物質輸送の現地観測


気象擾乱を考慮した陸奥湾の流動解析

気象擾乱を考慮した陸奥湾の流動解析


陸奥湾の流動構造とその影響因子に関する研究

陸奥湾の流動構造とその影響因子に関する研究


係留気球と無人航空機を活用した災害対応情報支援システムの構想

係留気球と無人航空機を活用した災害対応情報支援システムの構想


海辺の環境再生活動の社会的価値算定の試み~尼崎運河での環境活動を事例として~

海辺の環境再生活動の社会的価値算定の試み~尼崎運河での環境活動を事例として~


阿南市を流れる河川の水質と水棲生物

阿南市を流れる河川の水質と水棲生物


東みよし町の河川と池沼の水質

東みよし町の河川と池沼の水質


吉野川市山川町を流れる川田川・ほたる川の水質

吉野川市山川町を流れる川田川・ほたる川の水質


つるぎ町を流れる吉野川水系貞光川の水質

つるぎ町を流れる吉野川水系貞光川の水質


阿波市の河川と池沼の水質

阿波市の河川と池沼の水質


美馬市美馬町の河川と池沼の水質

美馬市美馬町の河川と池沼の水質


ヤマトオサガニの造巣活動に関する物理的な生物撹拌作用

ヤマトオサガニの造巣活動に関する物理的な生物撹拌作用


美馬市木屋平を流れる一級河川穴吹川の水質

美馬市木屋平を流れる一級河川穴吹川の水質


アンケート調査による地震防災対策強化および推進地域内での大学防災の特徴に関する一考察

21世紀の南海地震と防災

21世紀の南海地震と防災