北京山区次降雨侵蚀力

Estimation of Daily Rainfall Erosivity in Beijing Mountainous Area

降雨侵蚀力反映了降雨对土壤侵蚀影响的潜在能力 ,它是建立土壤水蚀预报模型的基础。为了进行无降雨过程资料地区的降雨侵蚀力计算 ,选取了密云 1993～ 1998年共 15 4次降雨过程资料和蒲洼 1992～ 1995年共 4 7次降雨过程资料 ,对 CREAMS模型中的次降雨侵蚀力公式进行了检验。检验结果发现 ,CREAMS模型次降雨侵蚀力公式计算结果在北京山区不同地区有较好的稳定性 ,密云和蒲洼模型计算结果的模型有效系数分别为 0 .80 4和 0 .6 90。因此在北京山区 ,当缺乏降雨过程资料时 ,可采用 CREAMS模型次降雨侵蚀力公式进行次降雨侵蚀力计算。

The rainfall erosivity can suggest the potential effect of rainfall on soil erosion. It is necessary to develop the water erosion model. The models used in CREAMS for calculating erosivity from daily rainfall data were tested at two locations that lie at Miyun and Puwa, in Beijing mountain areas. The results suggest that the difference of the model efficiency of equation in CREAMS did not vary significantly between sites at Beijing mountain areas. The model efficiency of the equation in CREAMS was 0.804 at Miyun, and 0.690 at Puwa. So the equation for calculating the rainfall erosivity in CREAMS should be used in Beijing mountain areas when the continuous record of rainfall are lack.