不同防渗条件下渠道渗漏及渠边土壤含水量试验研究

The Experimental Study on Canal Seepage and Side Soil Water Content Under Different Seepage Conditions

通过对4种不同防渗措施的渠道进行渗漏试验,研究渗漏强度、累计渗漏量、渠边土壤含水量在不同防渗措施下的动态响应。结果表明,渠道渗漏不仅受到渠道衬砌形式的影响,亦受到渠床下土质特性的影响;廉价的渠床夯实处理的防渗效果并不比干砌卵石防渗效果差;不同防渗措施在不同入渗阶段表现出一定的效果差异,实践中可以根据渠道年均持续通水时间规划渠道防渗措施;混凝土防渗效果虽然最佳,但在现代灌区续建配套与节水改造规划中应对其生态效应加以论证,做到在提高渠系水利用系数的同时,将对生态环境的负面影响降至最低。

The experimental studied on the dynamic responses of canal seepage rate;cumulative amount and side soil water content to the four kinds of Canal Seepage.The results indicated that the canal seepage rate could be effected not only by lining forms but aslo by soil properties under channel bed.The seepage-control effectiveness of low-cost channel bed compaction treating was not worse than dry build by laying bricks or stones pebble.The different seepage-control measures showed some different on effects in different stages of infiltration.In practice, the seepage-control measures could be planned on the basis of the average duration flowing water time.The effectiveness of seepage-control concrete was the best,but the ecological efficiency should be proved in the modem irrigated area rebuilding and water saving reconstruction planning.The nega- tive effects on entironment should be reduced to minimum when the water efficiency of canal system could be increased.