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沟道小流域的沟道面积与流域面积之比,称沟道小流域的切割裂度。沟道小流域的切割裂度(以下简称切割裂度),是反映土壤侵蚀强度的一项极为重要的数量指标,在土壤侵蚀区划及土壤侵蚀规律的研究中,许多学者对此十分重视。本文通过杏子河流域切割裂度的实际量算,得出该流域切割裂度的平均值为0.63;中游切割裂度大于上下游的纵向分布;主河道偏移左岸、切割裂度亦大于右岸的横向分布规律。因此,我们根据该流域沟道网结构的特点,提出两种量算切割裂度的选样方法。经过量算试验,其结果,样区切割裂度的平均值与该流域实际量算平均值非常接近,误差均在±0.02范围内。
The ratio of the channel area to the basin area in a small channel of a channel is called the cleavage factor of a channel in a small channel. The cleavage in small gully watersheds (hereinafter referred to as “cleavage”) is an extremely important quantitative index reflecting the intensity of soil erosion. Many scholars attach great importance to this in the study on the rules of soil erosion division and soil erosion. According to the actual calculation of cutting rift in Xingzihe river basin, the average value of the cutting rift in the basin is 0.63. The cutting ripple in the middle reaches is larger than the vertical distribution in the upstream and downstream. The left bank and cutting crack of the main channel are also larger than the right bank Horizontal distribution. Therefore, based on the characteristics of the channel network structure in this basin, two sampling methods for measuring the cutting crack are proposed. After the amount test, the result shows that the average value of the sample cutoff and the average value of the actual count of the basin are very close, the errors are within ± 0.02.