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
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THE GEOLOGICAL一GEOMORPHOLOGICAL CONDITIONS AND CALCULATION AND EVALUATION OF ERODING CAPACITY IN TANGJIABO RIVER VALLEY OF GANSU PROVINCE
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    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 110 45' amounts to 85.400 of the drainage area;Gullies there are cut slightly,the ditch density in the greater gullies being only 0.7一0.8km/km2.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 hydrological data showed that eroded modulus per year in this valley is up to 4,500t/km2.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切produce a great quantity of sand一seasonal congelifraction. It is calculated that the congelifraction of this kind may produce a sand amount being equal to 36.5一41 .8%of the total sand produced in this valley.Such facts are common in a number of counties near Dingxi County.

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包忠谟.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[J].水土保持通报,1987,(2):22-27

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  • 在线发布日期: 2014-12-01
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