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而降雨侵蚀力是定量监测评价一个地区土壤侵蚀状况的重要因子之一,找到适宜简便的计算方法十分重要。本文利用位于豫西山区鲁山县的两个水文站各三年共125次自记降雨过程资料,建立了该区域次降雨侵蚀力计算模型:R次=0.146×Pt×I30-1.189(r=0.992,n=105);并进行了预报效果检验,采取模型有效系数和相对偏差评价模型的的效果,结果表明二者分别为99%和8.8%。本文所创立的次降雨侵蚀力模型简便实用,不仅可以评价区域年R值分布,有效地分析R值的年内分布状况,更重要的是为水土流失定量监测从多年平均监测、年监测提高到次降雨流失量的监测提供了可能,从而实现区域定量监测的精度。
Rainfall erosivity is one of the most important factors for quantitative monitoring and evaluation of soil erosion in a region. It is very important to find suitable and convenient calculation methods. In this paper, a total of 125 self-recorded rainfall data were collected from two hydrological stations located in the Lushan County, western mountainous area of Henan Province. The rainfall erosivity calculation model of this area was established: R = 0.146 × Pt × I30-1.189 (r = 0.992, n = 105). The forecasting effect was tested and the effect of model validity coefficient and relative deviation evaluation model was tested. The results showed that the two models were 99% and 8.8% respectively. The sub-rainfall erosivity model established in this paper is simple and practical. It not only can evaluate the distribution of annual R value in the region, but also can effectively analyze the annual distribution of R value. More importantly, from the multi-year average monitoring to the quantitative monitoring of soil and water loss, The monitoring of rainfall loss has made it possible to achieve the accuracy of regional quantitative monitoring.