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海水面上昇に伴う河口域および沿岸地下水への塩水侵入による災害の予測に関する研究

海平面上升咸水入侵河口及沿岸地下水灾害预测研究

基本信息

批准号：
02201132
负责人：
近森邦英
金额：
$ 1.02万
依托单位：
Kochi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas
财政年份：
1990
资助国家：
日本
起止时间：
1990 至无数据
项目状态：
已结题

项目摘要

近森・紙井は土佐湾沿岸潮位の変化について研究し、年間変動は海水の密度変化により説明できること、室戸・土佐清水に於ける経年変化は認められないが中央部(桂浜)では低下傾向を見いだした。また、近森は高知県春野町甲殿地区において潮位変動が不圧地下水位と塩水楔に与える影響および透水量係数の推定法について研究し成果を得た。尾島は芦田川(福山市),加茂川(西条市)の河口域およぴ長柄川河口輪中地帯における塩分侵入に関しても検討した。芦田川では河口堰の建設によって周辺地域の地中塩分は排出され、現状では大きな問題はない。西条市域では自噴帯の減少や水質の劣化が認められており、これらについて若干の理論的解析を試みた。過去に建設された地中不透水壁の存在が塩分侵入の阻止に大きく貢献していることが分かった。大橋は道前平野の中山川流域臨海部において3地点の被圧地下水井戸について観測を実施し潮汐変化(新居浜港)との対応を検討した。調和分解を用いて伝播波形の減衰特性と位相ズレを知り、海底成層と帯水層が2地点は密封型,1点が開放型と判明した。これにより帯水層係数が求まり潮位変化の影響吟味が可能となつた。柿沼は長方形自由地下水帯について分散モデルにより数値実験を行い、海水面上昇に伴って帯水層出口下部に循環流が発達すること,海水が地表面に達することがあることなどを得た。また、愛媛県興居島北浦地区の自由地下水帯における海水位上昇に伴う塩水侵入を揚水量、潅水量を与えることによつてシミュレ-トし、塩水侵入状況を推定できた。玉井は自然海浜および人工海浜の砂浜模型を作成し、海水面上昇を想定して平常時波浪及び荒天時波浪を繰り返し作用させ、水位上昇及び堤防の有無による海浜変形特性を明らかにした。一方,海水面上昇にともなう高知市街区の浸水域を微地形図を用いて推測し、洪水、高潮時、下水渠等による浸水危険度の予測を行つた。

Research on changes in tide level along the coast of Tosa Bay near Mori and Kawaii, and explanation of changes in density of seawater due to year-to-year changes.と, Muroto, Tosa Shimizu, who changed in the ける経 year, recognized the central part of the められないが(Katsurahama), and the low tendency を见いだした. The results of the research on the influence of tidal level change and groundwater level on the Koden area of Kochi Prefecture Haruno-cho Koden area and the influence of water wedge and water permeability coefficient on the method of estimating the water permeability coefficient are obtained. Oshima, Ashida River (Fukuyama City), Kamo River (Saijo City), Kamo River (Saijo City), Nagahara River Estuary, and Nagahara River Estuary Areas are divided into two parts. The construction of the Ashida River estuary weir and the surrounding area are divided and discharged, and the current situation is large and the problem is solved. The water quality in Saijo City has been reduced and the deterioration of water quality has been reduced, and the water quality has been reduced and the water quality has been degraded. Analysis and analysis of several theories have been carried out. In the past, the existence of the impermeable wall in the ground was constructed, and the intrusion was prevented, and the large contribution was made. Ohashi, Michimae plain, Nakayama River watershed, seaside part, 3 locations, pressured underground water wells, tidal change (Niihama Port), and underground wells. The harmonic decomposition is used to determine the attenuation characteristics of the waveform and the phase, the seabed layer and the water layer, the 2-point sealed type, and the 1-point open type and the clear type. The water layer coefficient of the water layer is determined by the influence of the tide level change on the taste. Kakinuma's rectangular free groundwater is dispersed and the sea level is rising. The lower part of the water layer outlet has a circulating flow, and the sea water reaches the surface of the ground. Free groundwater in the Hokuura area of Koi Island, Ehime Prefecture, and the sea level rise is accompanied by the intrusion of sewage water. The amount of uplifted water, the amount of water flowing down, and the water intrusion situation are estimated based on the amount of water pumped out and the water intrusion. Tamai natural beach, artificial beach and sand beach model are made, and the sea level rise is assumed to be normal waves and drought. The nature of the waves and the return of the weather, the rise of the water level, and the presence or absence of embankments are all related to the shape of the seashore. On the one hand, the rising sea level is expected to cause the submergence of the submerged waters in the Kochi City area, and the risk of flooding such as floods, high tides, sewers, etc.