contributing area meaning in English

集水面积

The algorithm improved to calculate the ln ( / tan # ) index is presented , in which the area of the current cell is included in the calculated total cumulative contributing area of downslide grid cell
提出一种简单的地形指数in ( a / tanp )计算方法，该方法分别计算dem网格单元的a和tanp ，对坡度为。
The calculation method of ln ( / tan # ) index widely used is the multiple flow direction algorithm developed by quinn et al . it can been seen that , in the algorithm , the contour length normal to the direction of flow flowing out the current cell is used to determine both a and tan # , and that the calculated total cumulative contributing area of downslide grid cell does not include the area of the current cell
目前普遍使用的计算该地形指数的方法为多流向法。方法中计算和tan用的均是与流出单元网格流向垂直的等高线长。另外计算下坡单元网格累积汇流面积时没有考虑欲计算ln ( tan )值的单元网格的面积，这些是不合理的。