三峡库区梅溪河河口干支流界面水流特征

发布时间：2018-03-05 20:53

  本文选题：支流河口　切入点：库湾　出处：《水利水电科技进展》2017年03期 　论文类型：期刊论文

【摘要】：通过对三峡库区中部典型支流梅溪河库湾水动力参数及水体温度、浊度数据进行分析,研究水库运行各时期梅溪河河口干支流界面水流特性,探讨其影响因素以及水交换对库湾的影响。结果表明:梅溪河河口双向水流特征明显,在温差异重流、干流惯性作用以及库区水位变动等因素影响下,干支流界面水流强度、进出水体间界面结构及形态在不同运行期有显著差异;由于双向水流结构的存在,尽管梅溪河河口干支流界面净流量较小(多小于100 m~3/s),但是干支流水体的交换量相对显著,介于314.17~535.26 m~3/s之间,可达净流量的4~40倍;在净流量最小的低水位运行期,干流倒灌水体基本能到达支流库湾常年回水区的末端。
[Abstract]:Based on the analysis of hydrodynamic parameters, water temperature and turbidity data of the typical tributaries in the middle part of the three Gorges Reservoir area, the characteristics of the water flow at the interface of the main tributaries of the Meixi River estuary in each period of operation of the reservoir are studied. The effect of water exchange on Kuwan is discussed. The results show that the characteristics of bidirectional flow in Meixi River estuary are obvious. Under the influence of temperature difference density current, inertial effect of main stream and water level change in reservoir area, the interfacial flow intensity of main tributaries is obvious. The interfacial structure and morphology of the inlet and outlet water bodies have significant differences in different operation periods. Because of the existence of bidirectional flow structure, although the net discharge of the interface of the main tributaries of the Meixi River estuary is smaller (less than 100 mm3 / s ~ (-1)), the exchange capacity of the tributaries is relatively significant. In the range of 314.17 ~ 535.26 m / s, the net flow can reach 4 ~ 40 times of the net flow, and in the period of low water level with the smallest net flow, the backflow of the main stream can basically reach the end of the annual backwater area of the tributary Kuwan.
【作者单位】： 华东师范大学河口海岸国家重点实验室;上海大学环境与化学工程学院;
【基金】：国家自然科学基金(41271519) 国家水体污染控制与治理科技重大专项(2012ZX07104-001)
【分类号】：TV133
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本文编号：1571838