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EVALUATION OF HYDROLOGIC SYSTEMS IN TAKAMATSU AREA AND THE EFFECTS OF WATER TRANSFER THROUGH KAGAWA TRANS-BOUNDARY CHANNEL

高松地区水文系统评价及香川跨境渠道调水影响

基本信息

批准号：
13838010
负责人：
KAWAHARA yoshihisa
金额：
$ 2.37万
依托单位：
Kagawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13838010/
关键词：
hydrologic systems water balance groundwater level groundwater quality Takamatsu Kagawa water channel geological information database water use 現地観測データベース地下水ため池

项目摘要

The present study aimed to understand the hydrologic systems in Takamatsu and the effects of Kagawa trans-boundary water channel with emphasis on groundwater. Main results can be classified and summarized as follows.1. The database was created about ground elevation, land use, geology, water use, meteorology and digitalized using a GIS software, ArcGIS. In particular, the digital geological information database of Takamatsu was established based on existing boring data at more than two thousands stations.2. Unconfined groundwater has been monitored at 65 stations and confined groundwater at 7 stations quarterly to clarify the temporal and spatial variations of the groundwater level and quality. It was confirmed that the unconfined groundwater level shows the highest in late summer and the lowest in winter and spring with annual change of 1-2 m and that the contour lines mostly run parallel to those of ground level. Concerning the water quality, Stiff diagrams and the cluster analysis d … More emonstrated that groundwater quality has shown little change with a few stations where the effects of fertilization and sea water intrusion were detected. Tritium analysis of confined groundwater indicated that unconfined groundwater has penetrated into the confined aquifer.3. Water balance analysis was made to quantify hydrologic systems at present and before the construction of Kagawa water channel. It suggested that the water channel and the land use change have led to considerable changes, i.e., the increase of surface runoff by 30mm, river low flow by 190mm and effluent from sewage system by 270mm and the decrease of evapo-transpiration by 60mm, infiltration into ground by 150mm and the groundwater uptake by 170mm.4. Numerical simulation of confined groundwater flow was performed on 500m x 500m mesh with estimated hydro-geological parameters, groundwater exploitation, initial and boundary conditions. Although the calculations show reasonably well results against recorded water levels at four stations, further improvement is necessary the reliable estimation of allowable groundwater uptake. More detailed information on hydro-geological parameters and groundwater exploitation rates is highly necessary. Less

本研究旨在了解高松的水文系统和香川跨界水道的影响，重点是地下水。主要研究结果可归纳如下：1.建立了关于地面高程、土地利用、地质、用水、气象的数据库，并使用地理信息系统软件ArcGIS进行了数字化。特别是基于现有的两千多个测站的钻孔数据，建立了高松数字地质信息数据库.对65个地下水监测站和7个地下水监测站的地下水进行了季度监测，以了解地下水水位和水质的时空变化。结果表明，该区潜水水位在夏末最高，冬春季最低，年变化幅度为1-2 m，等高线多与地面等高线平行。在水质方面，Stiff图和聚类分析方法， ...更多信息这表明，地下水质量几乎没有变化，只有少数几个监测站检测到施肥和海水入侵的影响。承压地下水氚分析表明，承压地下水已渗入承压含水层.通过水量平衡分析，量化了香川水道建设前和现在的水文系统。这表明，水道和土地利用的变化导致了相当大的变化，即，地表径流量增加30 mm，河流枯水量增加190 mm，污水排放量增加270 mm，蒸散量减少60 mm，入渗量减少150 mm，地下水吸收量减少170 mm.在500 m × 500 m网格上，根据水文地质参数、地下水开采量、初始条件和边界条件，对承压地下水流进行了数值模拟。虽然计算结果与四个站的记录水位相当吻合，但仍需进一步改进，以可靠地估算地下水的允许吸收量。关于水文地质参数和地下水开采率的更详细资料是非常必要的。少