灌区渠道防渗工程规划研究

Planning of Canal Anti-seepage Project in Irrigation District

针对渠道防渗中的一般问题 ,从不同层面上研究了进行规划的一些技术问题。包括渠道衬砌功能定位和灌区防渗的总体规划 ,并重点研究了井渠结合灌区的防渗效果分析 ;结合防渗效果和投资效益 ,研究了渠道防渗的优先级别选择和布局 ;根据渠道防渗将使水力要素发生显著变化 ,破坏原渠系的水位衔接 ,提出缩窄底宽、改变坡降和改变边坡的改造方案 ,通过图表 ,分析各种方案的技术可行范围。

For present large-scale irrigation system rehabilitations being carried out nationwide, it is proposed to pay more attention to planning of irrigation canal anti-seepage project. Several techniques concerned were analyzed and discussed on different view-points for dealing with the common problems in irrigation canal anti-seepage project construction. The main functions of lining-canals, engineering planning, effects of reducing water loss in systems of utilizing combinatively surface water and groundwater, investment efficient, and priority levels of different canals were researched in this paper. It was also pointed out that more attention should be paid to the significant changes of canal hydraulic factors and to prevention of disturbing water level relationship in canal system resulted in by canal lining. Some rehabilitation measures, such as narrowing canal bottom, and changing canal side and bottom slopes were put forward. The suitable ranges of these technical measures also ware indicated with tables and figures.