INTERACTION PROCESS BETWEEN STREAM AND AQUIFER IN THE YASUGAWA ALLUVIAL FAN
INTERACTION PROCESS BETWEEN STREAM AND AQUIFER IN THE YASUGAWA ALLUVIAL FAN
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安川冲积扇河流与含水层相互作用过程
DOI：
10.2208/prohe.48.385
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
Tatsuya Yamada
中科院分区：
文献类型：
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作者：
M. Harada;Kazuyoshi Okajima;Tatsuya Yamada
流经冲积区的河流不仅在河道中流动，而且河水与河岸地下水有某种相互作用，例如渗入含水层或从含水层渗出。特别是在人工取水的小流量河流中，河流与含水层之间的相互作用可能是控制河流状况的重要因素。由于流量的显著减少不仅影响水力量，而且影响水质和温度，因此有必要保持最小流量以保护河流环境。本文通过野外调查和水力学分析，研究了河流与含水层之间的关系，以评价最小流量。根据安川冲积扇的观测资料，推测河流流量的变化可能是由于与含水层的水交换引起的。计算结果表明，该水力模型可作为定量评价最小流量的有效工具。
A river running through an alluvial area does not flow in the channel only; rather, the stream-water has some interaction with riparian groundwater, such as infiltration into an aquifer or exfiltration from the aquifer. Especially in case of the stream flowing with small discharge due to an artificial intake, the interaction between stream and aquifer may be important factor governing the stream condition. Because remarkable decrease of the discharge affects not only hydraulic quantities but also water quality and temperature, it is necessary to keep a minimum stream discharge in order to preserve the river environment. In this paper, toward evaluation of the minimum discharge, relationships between stream and aquifer are investigated through field investigations and hydraulic analyses. According to the observations in the Yasugawa alluvial fan, it is supposed that variation of the stream discharge may be caused by water exchange with the aquifer. The finding from the computed results indicates that this hydraulic model can become a useable tool for quantitative evaluation of the minimum discharge to keep the stream condition suitable.