权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

A study of groundwater management (development utilization conservation) in the Rokugo Alluvial Fan, Akita Prefectre

秋田县六乡冲积扇地下水管理（开发利用保护）研究

基本信息

批准号：
61580209
负责人：
HIDA Noboru
金额：
$ 1.41万
依托单位：
Akita 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：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

The Rokugo alluvial fan lies 39 25' north latitude and 140 34' east longitude in northern Japan. It covers an area of nearly 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 shallow 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.Ground water levels are 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 centimeters in depth.Gound water recharge via paddy fields was tested during the winters of 1985/86 and 1986/87 in order to protect declining water levels. The site was selected fron an area of paddy fields in the middle of the fan : 12,493 square meters in 1985/86 and 15,588 square meters in 1986/87. This place was known through field observations to be one of the most effective recharge areas for the ground water in the fringe. A volume of water, which was withdrawn from an irrigation canal, was supplied at the rate of ca. 1,600 liters per minute from Nov. 7, 1985 to March 31, 1986 and of ca. 3,000 liters per minute from Oct. 24, 1986 to March 31, 1987.It could be found that the recharge tests had an effect as regards the rise of ground water levels. A reference to water quality is omitted in the abstract.

Rokugo冲积扇位于日本北部北纬39 25度，东经140 34度。它占地面积近14平方公里。风机的头部（海拔90米）和外边缘（海拔45米）之间的距离约为4公里。位于边缘的六吾镇中心有7000名居民。他们私下打浅井，抽取不受限制的地下水供家庭使用。地下水在扇形区域进行补给，主要用于水稻种植。在5 - 8月的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的时候，最低水位出现在积雪达到最大值的时候，通常在130厘米左右。1985/86年和1986/87年冬季试验了通过水田补给地下水，以保护不断下降的水位。场地选择在扇形中间的稻田区域：1985/86年12,493平方米，1986/87年15,588平方米。通过实地观察，我们知道这个地方是边缘地区地下水最有效的补给区之一。从1985年11月7日至1986年3月31日，从灌溉渠抽取的水以每分钟约1600升的速度供应，从1986年10月24日至1987年3月31日，以每分钟约3000升的速度供应。可以发现，补给试验对地下水位的上升有影响。摘要中省略了对水质的提及。