GIS援用による広域地下水流動逆解析による透水量係数の同定

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  • Identification of transmissivities in land subsidence area based on back analysis of groundwater flow aided by GIS

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Northern Kanto Plane has severely been affected by land subsidence due to groundwater abstraction. It is necessary for decision making of abstraction to determine a precisely distributiono f groundwaterf luctuationd ue to groundwatera bstractioni n the objectivea rea. Finitee lementm ethod is used to determineh ow the groundwaterf luctuationd istributeso ver the area. It is necessaryf or calculatingin advance to know transmissivitieosf ground in the hole area.H owever, i t is difficultt o get the informationfr om in-situi nvestigationisn the case of the wide area such as the Northern Kanto Plane. In this study, therefore, the transmissivities were identified by means of back analysis of the groundwater level and abstraction data collectedf or 10 years. GIS has been used for establishingd atabasesw hich are necessaryt operformb ack analysisa nd thent o visualizet her esultsf romt he finitee lementa nalysis.

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