水平梯田减水减沙效益计算探讨

针对水平梯田常用的数理统计计算减水减沙效益存在的问题,提出了同时考虑汛期降水量和梯田标准的汛期降水量相关分析法。该法在进行拦蓄效益计算时,首先将水平梯田按田亩宽度、坡度、田坎完好程度、边埂高度等,将水平梯田分为三类,然后根据小区观测资料及其它调查结果,绘出了不同标准水平梯田的汛期降水量与减水减沙效益关系曲线。各地可直接利用该曲线,查出水平梯田减水减沙效益值。

Discussions on Calculation of Water and Sediment Reduction Benefits of Terraces

The paper puts forward to consider simultaneously the correlation analysis method of flood season pre cipitation and flood season precipitation of terrace standards in accordance with the existing problems in cal culating water and sediment benefits by using commonly used mathematical statistics of terraces. In the cal culation of storage benefits by this method, first, the terraces are divided into three types based on the width, slope, completed degree of ridges of fields and heigth of low banks between fields. Then, it draws a relation curve between precipitation in flood seasons of differrent standard terraces and benefits of water and sedi ment reduction based on observed data of plots and other investigation results. Each place can find out the benefit value of water and sediment reduction of terraces by using the curve.