The box body prefabricates a compound ring enclosed type groundnet, and an earthing pole is reserved at the upper part of the box body;
箱体预制复合环形封闭式地线网，并且在箱体上部留出接地极；
2
Based on analyzing the physical process of runoff generation, a method for partition of surface and groundnet rainfall and runoff generation is proposed.
对流域产流的物理过程进行了分析，建立了地面及地下净雨划分的数学公式及流域产流的计算方法。
3
This several thousand meter long groundnet can not only resist the sand in the primary-harm wind direction but also guide the sand in the secondary-harm wind direction.