黄土丘陵沟壑区坝地防洪保收试验研究

坝地土肥水足 ,抗旱能力强 ,是黄土丘陵沟壑区发展高产、优质、高效农业的理想境地。但是 ,该区雨热同步、暴雨洪水集中 ,6— 9月份坝地常常遭受洪涝灾害 ,如何作到防洪保收 ,有许多问题值得探讨。本文以山西省离石市王家沟流域为例 ,通过实地调查、定位观测试验 ,得出如下结论 ,坝地次洪水淹水深度 <0 .7m、淹水历时 <7天 ,对玉米、高粱等高干作物生长影响不大 ,可以作为坝地防洪保收的标准 ;也可以作为今后进行沟道坝系工程建设、合理设计排洪渠断面尺寸的科学依据。

A Study on the Problems of Dam Land''s Avoiding Flood and Ensuring Harvest in Loess Hilly Region

Dam land has abundant fertility, sufficient water, and powerful ability for resisting drought. It is a good circumstance to develop agriculture in the Hilly Loess Region. But flood and waterlogging occurs frequently in this region. How to avoid flood and ensure harvest in dam land, many problems is to be probed. This paper instances Wangjiagou in shanxi province, obtains a conclusion by means of investigation and experiment. That is if the flood's depth smaller than 0.7m and period shorter than 7d, then maize and sorghum can grow normally. It can be taken as standard for avoiding flood and ensuring harvest in dam land , and asa scientific base for constructing dam and designing drainage channel.