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Studies on the Effective Rainfall of Upland Irrigation Design Water Requirement

旱田灌溉有效降雨量设计需水量研究

基本信息

批准号：
01560256
负责人：
KOMAMURA Masaharu
金额：
$ 1.54万
依托单位：
Tokyo University of Agriculture
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01560256/
关键词：
Upland Irrigation Design Water Requirement Precipitation Effective Rainfall Upland Water Requirement Pumping Water Requirement Water Control 点滴灌漑多孔管灌漑

项目摘要

The amount of upland irrigation water requirement was necessary to reconsideration viewpoint of practice upland irrigation, in humid region like Japan.This study examines about relationships between upland irrigation water requirement and the effective rainfall, of the experimental farm and upland irrigation field.The results are summarized as follows :1. The irrigation effect was admitted at proper irrigation water quantity at the Atsugi Central Experimental farm. But it happened that over irrigation, by increase of precipitation at the drip irrigation test farm.2. The quantity of water use was dependent on kind of crops, season and effective rainfall. But amount of effective rainfall was little influenced for amount of upland irrigation water requirement.Because it was difficult to presume of precipitation and to control of water taken through intake facilities.3. The settlement method of this study was calculation of effective rainfall by take statistics, and the relationships of practice effective rainfall at the upland irrigation area from precipitation data. And the small portion of rainfall, which was considered ineffective at the planning time, is useful for increase of soil moisture and admitted for effective rainfall. And the drip irrigation system had been useful in saving water and increase of effective rainfall.4. If this study's methods are recommended in used, the reduction plan of irrigation water demand may be expected. Then it is possible to cultivation at the little water source rural.

在日本这样的湿润地区，高地灌溉需水量的确定是重新认识旱地灌溉实践观点的必要条件，本研究通过对试验田和高地灌溉田的研究，探讨了高地灌溉需水量与有效降雨量的关系，主要结果如下：1.厚木中央试验场在适当的灌溉水量下，灌溉效果得到承认。但在滴灌试验田，由于降水量的增加，出现了过灌现象.水分利用量与作物种类、季节和有效降雨量有关。但有效降雨量对高地灌溉需水量的影响不大，因为降水量难以预测，取水设施取水量难以控制.本研究的解决方法是采用统计学的方法计算有效降雨量，并根据降雨量资料，建立了高地灌区实际有效降雨量的关系。而规划时认为无效的小部分降雨，对增加土壤水分是有益的，并被允许为有效降雨。滴灌系统在节水和提高有效产量方面取得了显著效果.若将本研究方法推广应用，则灌溉需水量削减方案可望实现。这样就有可能在农村的小水源地种植。