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Research on the monitoring of groundwater level movement in alluvial fan

冲积扇地下水位运动监测研究

基本信息

批准号：
03680207
负责人：
HIDA Noboru
金额：
$ 1.34万
依托单位：
AXkita University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
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 Rokugo alluvial fan lies 39^o 25' north latitude and 140^o 34' east longitude in northern Japan. It covers an area of neary 14 square kilometers. The distance between the head, 90 meters above sea level, and outer fringe, 45 meters above sea level, of the fan is about four kilometers. The center of Rokugo town which is situated on the fringe numbers 7,000 inhabitants. They privately bore wells and pump unconfined ground water for domestic uses. Ground water is recharged in the fan's area, which is utilized mainly for rice cultivation.The author performed a study of the monitoring of ground water level movement in this alluvial fan in the three years from 1991 to 1993. Piezometers, of which depths are 20, 50 and 100 meters, were constructed at the center and the outer fringe, respectively. Hydraulic heads were measured by the piezometers.Some results are obtained : (1) Hydraulic heads clearly differ in each depth.Some results are obtained : (1) Hydraulic heads clearly differ in each depth. (2) Hydraulic head decreases from shallow point to deep point from the ground surface. (3) Difference of the hydraulic heads appears in every seasons, such as irrigated period and non-irrigated period as well snow-covered period and snow melting period. (4) Ground water level changes as follows : It is high during the season of melting snow and the period of irrigation activities from May to August. The highest level appears at the end of the melting of the snow and the beginning of irrigation, and the lowest one occurs around the time when snow cover reaches a maximum, which is usually about 130-150 centimeters in depthj.The results of the study will lead a next research project, "Forcasting Ground Water Lever in Alluvial Fan."

六乡冲积扇位于日本北方，北纬39 ° 25'，东经140 ° 34'。它占地近14平方公里。从海拔90米的扇头到海拔45米的扇外缘之间的距离约为4公里。位于边缘的六乡镇中心有7,000名居民。他们私自威尔斯，抽取无压地下水供家庭使用。本文作者在1991 ~ 1993年三年中对该冲积扇地下水位动态进行了监测研究。分别在中心和外缘建造了深度为20、50和100米的压力计。通过测压管测压试验，得到了以下结果：（1）不同深度的水头差异明显。(2)从地表到地表，水头从浅点到深点逐渐减小。(3)在灌溉期和非灌溉期、积雪期和融雪期，各季节的水头都有差异。(4)地下水位变化如下：5月至8月，在融雪季节和灌溉活动期间，地下水位较高。最高水位出现在积雪融化结束和灌溉开始时，最低水位出现在积雪达到最大值时，通常为130-150厘米。"