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针对黄土高原丘陵沟壑区沟道整治工程造成的下垫面的剧烈变化,通过野外调查、室内试验模拟的方法,研究了流域沟道不同整治比例(0%、20%、30%、40%、50%)、不同降雨强度(40、60、80、100、120mm/h)情况下,沟道地表径流流速变化、流域控制工程坝前蓄水变化及对沟道洪水标准的影响。结果表明,随着沟道整治比例的增大,相对于沟道无整治工程时地表径流平均流速分别减小6.21%、10.95%、19.85%、21.78%,流域控制工程坝前平均蓄水分别减小3.94%、15.55%、17.23%、23.90%,径流系数由无整治工程时的0.80减小至0.61。随着降雨强度的增大,平均流速由0.102m/s增大至0.160m/s,流域控制工程坝前平均蓄水与40mm/h时相比分别增加5.90%、24.17%、30.80%、38.82%,径流系数由0.59扩大至0.81。由此可见,流域沟道不同整治比例和不同降雨强度对流域控制工程的径流蓄积、径流系数及洪水设计均具有较大影响,实际工程设计中应考虑其影响,不可忽略。
Aiming at the drastic changes of the underlying surface caused by the channel regulation project in the hilly and gully regions of the Loess Plateau, the proportion of different reclamation courses (0%, 20%, 30%, 40% 50%), the variation of surface runoff velocity under different rainfall intensity (40, 60, 80, 100 and 120 mm / h), the change of water storage in front of the dam control engineering and the impact on channel flood standard. The results show that with the increase of the channel regulation ratio, the average surface runoff velocity decreased by 6.21%, 10.95%, 19.85% and 21.78% respectively compared with the non-regulation channel project, and the average water storage before the dam control project decreased by Small 3.94%, 15.55%, 17.23% and 23.90% respectively. The runoff coefficient decreased from 0.80 to 0.61 without any remediation project. With the increase of rainfall intensity, the average flow rate increased from 0.102m / s to 0.160m / s. The average water storage before the dam control project increased by 5.90%, 24.17%, 30.80%, 38.82 %, Runoff coefficient expanded from 0.59 to 0.81. It can be seen from the above that different proportions and different rainfall intensity of channel regulation have a great impact on runoff accumulation, runoff coefficient and flood design of river basin control projects. Actual engineering design should consider its influence and can not be neglected.