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唐家堡河小流域的地质地貌条件和土壤侵蚀量推算与评价
THE GEOLOGICAL-GEOMORPHOLOGICAL CONDITIONS AND CALCULATION AND EVALUATION OF ERODING CAPACITY IN TANGJIABO RIVER VALLEY OF GANSU PROVINCE
【摘要】 唐家堡河小流域内,地形起伏不大,沟间地面积较大,占流域总面积的85.4%,平均坡度近12°;沟谷切割微弱,河道密度仅0.7—0.8公里/平方公里;降水较少,强度也不大,可是年侵蚀模数竟达4,500吨/平方公里。通过调查分析,并进行了不同流失方式侵蚀量的推算,发现这是由于各种因素的综合影响。该流域内有一种产沙量很大的季节性冻融泥流,它的产沙量可达总产沙量的36.5—41.8%。此类冻融泥流,在当地邻近许多县普遍存在。
【Abstract】 Tangjiabo River valley,the terrain sloping gently,is a vast area of land between gullies with average slope 11°45′amounts to 85.4% of the drainage area;Gullies there are cut slightly,the ditch density in the greater gullies being only 0.7-0.8km/km~2.With respect to climate,there is smaller rainfall and less strong rainstorm.Under the conditions of landforms and climate described above,there would be no strong soil erosion.However,the hydro- logical data showed that eroded modulus per year in this valley is up to 4,500t/km~2.It has been found through intensive investigation of soil erosion and calculation of eroding capacity in different ways of erosion that greater eroded modulus in this valley is caused by geological-geomorphological and other factors.In this valley,there is a soil erosion way to produce a great quantity of sand-seasonal congelifraction.It is calculated that the conge- lifraction of this kind may produce a sand amount being equal to 36.5- 41.8% of the total sand produced in this valley.Such facts are common in a number of counties near Dingxi County.
- 【文献出处】 水土保持通报 ,Bulletin of Soil and Water Conservation , 编辑部邮箱 ,1987年02期
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