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山西省临汾地区水保试验站的试验基地——隰县唐户塬,1988年8月6日降了一场20O～300年一遇的短历时暴雨,未治理小流域洪峰流量模数18.57m~3(s·km~2),洪水径流量93250m~3/km~2。治理区24的梯田溢流冲壑,育林育草的沟坡20～30%泻溜滑塌,西埝沟49座淤地坝有47座不同程度破坏,但治理工程仍有缓洪拦沙作用。治理沟比不治沟减少洪量42.5%,洪峰模数削减80%,70％以上的梯田就地拦蓄了暴雨径流,沟壑淤地坝的落淤量大于冲走的土方量,坝地净增22.1亩。通过调查,对进一步搞好残塬沟壑区小流域治理得到一些新的启示。
Linyi, Shanxi Province, the pilot site of soil and water conservation test - Tang County, Shexian County, August 6, 1988 dropped a 20O ~ 300 years once the short duration of heavy rainfall, untreated watershed peak flow modulus 18.57m ~ 3 (s · km ~ 2), flood runoff 93250m ~ 3 / km ~ 2. In the treatment area 24, terrace overflow overflows and ravines, and 20-30% of the slopes of grassland for breeding and breeding are diarrheal and slippery. There are 47 silt dam in Xijiagou ditch with 47 degrees of damage, but there is still retardation of flood control and sediment control . Ditch management ditch to reduce the flood ditch 42.5%, flood crest reduction of 80%, more than 70% of the terraces to save storm runoff in situ, silt ditching silt dam sediment is greater than the amount of washed earth, the net increase of 22.1 acres . Through the investigation, we can get some new enlightenment to further improve the harnessing of small watersheds in the gullies.