豫西山区次降雨侵蚀力简化模型的建立

Symbolized Model for Simulating Rainfall Erosion Ability in the West-Mountainous Area of Henan Province

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。

Soil erosion is a major environmental threat to the sustainability and productivity of agricultural land. Rainfall erosion ability is a fundamental factor for quantitatively monitoring and assessment of soil erosion. Hence, it is very important to find a suitable model to estimate rainfall erosen ability, in particular , the individual rainfall erosen model Should be characterised by assessing the distribution of R-value. Based on 125 individual rainfalls data of two stations for 6 years, an individual rainfall eroson ability model was developed with the equation of Rn=0.146×Pt×^30 - 1.189. （r = 0. 992, n = 105）. Validation resuhs showed this model can be used in the region. It provides a possibility for quantitatively monitoring the level of soil losses caused by individual rainfall.