利用水文资料评价紫荆关水土保持工作

Evaluation of Water and Soil Conservation in Zijingguan area with hydrologic date

对紫荆关建国４６年来的降水、洪峰和输沙资料进行对比、分析，利用模糊数学的原理，按照“等比收缩”的方法绘制多年平均输沙关系曲线和多年平均最大洪峰关系曲线，最后得出自１９５０年到１９９５年紫荆关多年平均输沙减少９０．８９％，削减洪峰８０．７％的结论。

The date of precipiation, flood peak discharge and sediment discharge in Zijingguan area since the foundation of China for 46 years have been contrasted and analyzed. On the basis of fuzzy mathematics principle and “equiratio contract” method, and average annual sediment discharge relation curve and an average annual flood peak discharge relation curve have been mapped out. At last, it is concluded that the average annual sediment discharge and the average annual flood peak discharge have been reduced by 90.89% and 80.7% respectively.