三峡水库运行初期库区糙率特性分析

发布时间：2018-06-17 09:31

本文选题：三峡水库 + 水库淤积　；参考：《水电能源科学》2017年07期

【摘要】：为得到三峡水库实际运行后库区泥沙的淤积糙率,基于三峡水库运行10余年库区实测淤积资料、日均来流量与水位序列,采用一维水流模型推算了三峡水库正常蓄水运行以来库区沿程的综合糙率。结果表明,常年回水区峡谷段淤积较少,糙率随流量、运行时间变化较小,糙率相对较大;常年回水区宽谷段泥沙在主槽落淤后床面阻力减小,糙率逐年降低;常年回水区弯曲分汊段泥沙淤积严重,糙率逐年减小;变动回水段天然河道特性起控制作用,糙率相对稳定。同一洪水流量情况下,随运行时间推移和淤积发展,糙率总体减小。常年回水区糙率的降低值明显大于变动回水区糙率的降低值。三峡水库淤积过渡期糙率与河道部位、断面形态、河道形态等参数均存在一定关系。研究成果为三峡水库淤积与糙率的关系研究奠定了基础。
[Abstract]:In order to obtain the silt roughness of the reservoir area after the actual operation of the three Gorges Reservoir, the daily average discharge and water level series are based on the siltation data measured in the reservoir area for more than 10 years of the operation of the three Gorges Reservoir. The one-dimensional flow model is used to calculate the comprehensive roughness of the reservoir area since the normal storage operation of the three Gorges Reservoir. The results show that the siltation of the canyons in the perennial backwater area is less, the roughness varies less with the flow rate, and the roughness is relatively large, and the bed surface resistance decreases and the roughness decreases year by year after the siltation of the main channel in the broad valley section of the perennial backwater area. The sediment deposition is serious and the roughness decreases year by year in the flexural bifurcation section in the perennial backwater area, and the characteristics of the natural channel in the variable backwater section play a controlling role, and the roughness is relatively stable. Under the condition of the same flood discharge, the roughness decreases with the development of the running time and siltation. The decreasing value of roughness in perennial backwater area is obviously larger than that in variable backwater area. There is a certain relationship between the roughness of the three Gorges Reservoir during the siltation transition and the parameters such as channel position, section shape, river channel shape and so on. The results lay a foundation for the study of the relationship between siltation and roughness of the three Gorges Reservoir.
【作者单位】：重庆交通大学河海学院;重庆交通大学国家内河航道整治工程技术研究中心;
【基金】：重庆市社会民生科技创新专项项目(cstc2015shmszx30024) 重庆市基础与前沿研究计划项目(cstc2015jcyja90013)
【分类号】：TV145

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