基于数值分析的广域节水灌溉工程对水土保持的影响研究

Study on Influence of Wide Area Water Saving Irrigation Project on Soil and Water Conservation based on Numerical Analysis

规模性节水灌溉工程是影响降低我国农业水资源损耗、提高水资源利用率的重要水利工程,同时对区域水土保持工作尤其是地下水位也带来重要的影响。文章将根据新疆某片区大规模、广域型节水工程灌溉项目实例,基于数值分析预测模型,展开了节水灌溉工程对区域地下水位变化规律影响的研究,为区域水土保持工作提供指导。研究发现:①相对于土渠,混凝土节水衬砌渠道具有良好的防渗漏性能,相等水位水力作用下,30d内混凝土渠水的渗透距离仅达到土渠的7.84%,能够起到降低水资源耗费的结果;②数值分析预测模型应用模拟得出水流渗透深度呈指数型增长,相关性系数R2=0.9991,高度符合节水灌溉工程中的实际情况,可以将之推广到其他节水灌溉工程影响研究中。

Large-scale water-saving irrigation project is an important water conservancy project that can reduce the loss of agricultural water resources and improve the utilization rate of water resources in China.Based on the example of a large-scale and wide-area water-saving engineering irrigation project in Henan province,and based on the prediction model,this paper will conduct an in-depth study on the specific impact of water-saving irrigation projects on the regional groundwater level,so as to provide guidance for regional water and soil conservation.The study found that:compared with the soil canal,the water-saving lining channel of concrete has a good anti-leakage performance,under the hydraulic action of the same water level and the infiltration distance of the water in the concrete canal within 30 days is only 7.84%of that of the soil canal,which can reduce the consumption of water resources;prediction model is applied to simulate the water flow penetration depth with the correlation coefficient R2=0.9991,which is highly consistent with the actual situation of water-saving irrigation projects and can be extended to other water-saving irrigation projects.