Research on groundwater flow systems using the concentration of anions

利用阴离子浓度研究地下水流系统

基本信息

批准号：
03453169
负责人：
SUZUKI Yuichi
金额：
$ 3.78万
依托单位：
Univ.Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

The studies on groundwater flow system by using the concentrations of anion were carried out. The fields of studies are four areas ; Mt.Yatsugatake, the fluvial fan around the city of Gosen, the fluvial fan in the Nasunogahara, and Mt.Tsukuba.On the mountain slope of Mt.Yatsugatake, the high concentration area of HCO^<3-> and SiO_2 are found at the lower part of the slope, and groundwater in this area is considered that the residence time is large. The concentration of NO^<3-> is an indicator of pollution by fertilizer, and from the comparison of land use map, the polluted water is distributed in the area of farm or pasture, not paddy field.In the Gosen area, the stream lines of groundwater recharged by the Hayatuki River were estimated by the mapping of water qualities, and the lines are coincide with the lines extimated from the geological structure.From the results of the observations in the Nasunogahara, the shallow groundwater is polluted by the excrement of domestic animals, and the pollutant, for example NO^<3->, flows on the same route of the groundwater.On the slope of Mt.Tsukuba, the base flow were sampled and analyzed. The water quality changes remarkably in space, i.e., the concentration of samples of eastern part of the mountains are low and those of western part are high. These differences were caused by the differences of the weathering of rocks.From the results of field observations, there are some remarkable spatial changes in water quality of groundwater, especially in the concentration of anion. These spatial differences are useful to estimate the groundwater flow patterns or systems.The author will make plan for the study on the changes in water quality, especially in anion, to the downstream along the stream line.

利用阴离子浓度对地下水流系统进行了研究。研究领域有四个领域；八岳山、五泉市周边的河流扇、那须野原的河流扇、筑波山。在八岳山的山坡上，HCO^<3->和SiO_2的高浓度区位于坡下部，认为该区域地下水滞留时间较大。 NO^<3->浓度是化肥污染的指标，从土地利用图对比来看，污染水体分布在农田或牧场区域，而非水田。在五仙地区，河流通过水质测绘估算了早雪河补给的地下水线，该线与地质结构推算的线一致。从那须野原的观测结果来看，浅层地下水受到了地下水的污染。家畜排泄物和NO^3-等污染物与地下水同路流动。在筑波山山坡上对基流进行了采样和分析。水质空间变化明显，东部山区样品浓度低，西部山区样品浓度高。这些差异是由于岩石风化作用的差异造成的。从现场观测结果来看，地下水水质特别是阴离子浓度存在着显着的空间变化。这些空间差异有助于估计地下水流型或系统。作者将制定研究计划，研究沿河流线下游的水质变化，特别是阴离子的变化。