大伙房水库流场及水温分布的数值模拟研究

发布时间：2018-03-12 09:29

本文选题：MIKE3　切入点：大伙房水库　出处：《大连理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：大伙房水库位于辽宁省抚顺市东部,是一座以防洪、灌溉、供水为主兼具发电、养鱼等多种功能的水利枢纽工程。本文采用数值模拟的方法对大伙房水库的水动力特征以及温度分布的影响因素进行了研究。本文首先利用基于非结构化网格的MIKE3水动力模型,综合考虑风力作用、表层热通量以及入库径流等各种因素,建立了大伙房水库三维水动力模型。通过测站水位和温度模拟值与实测值之间的对比验证了所建立的模型。基于验证好的模型,对大伙房水库的流场进行了数值模拟研究,分析了径流和库区风场对于水库流场结构的影响。结果表明风是影响大伙房水库流场结构的主要因素之一,其对表层水体流速影响很大,并会在水库中层和底层产生补偿流态,而吞吐流对库区内水流结构影响较小。对大伙房水库的温度场进行了数值模拟研究,分析了入库流量和库区风场对于水库温度分布的影响。模拟结果显示垂向上大伙房水库为水温分层型水库,夏季时水库水温处于稳定的分层状态,秋季时水温不分层；水平方向上春季水库水体温度从上游至坝前区域递减,秋季时库区内水温从上游至坝前区域逐渐升高。分析结果表明风力作用会加强水库表面温水层与下层水体之间的交换,使表层水温降低,底层水温升高。入库流量的增大会使水库表层和底层水温同时升高,在一定程度上削弱温度分层。
[Abstract]:The Dahuofang Reservoir is located in the eastern part of Fushun City, Liaoning Province. In this paper, the hydrodynamic characteristics of Dahuofang reservoir and the influencing factors of temperature distribution are studied by numerical simulation. Firstly, the MIKE3 hydrodynamic model based on unstructured grid is used in this paper. Considering all kinds of factors such as wind force, surface heat flux and inflow runoff, The 3D hydrodynamic model of Dahuofang Reservoir is established. The model is verified by comparing the simulated values of water level and temperature with the measured values. Based on the verified model, the flow field of Dahuofang Reservoir is numerically simulated. The effects of runoff and wind field on the flow field structure of the reservoir are analyzed. The results show that wind is one of the main factors affecting the flow field structure of Dahuofang Reservoir, which has a great influence on the flow velocity of the surface water body, and will produce compensation flow patterns in the middle and bottom layers of the reservoir. However, the effect of huff and puff flow on the flow structure in the reservoir area is relatively small. The temperature field of Dahuofang Reservoir is numerically simulated. The effect of inflow flow and wind field on the temperature distribution of the reservoir is analyzed. The simulation results show that the vertical Dahuofang reservoir is a layered reservoir with water temperature, the water temperature of the reservoir is in a stable stratified state in summer, and the water temperature is not stratified in autumn. In the horizontal direction, the water temperature of the reservoir decreases from the upstream to the front of the dam in spring, and the water temperature in the reservoir increases gradually from the upstream to the front of the dam in autumn. The results show that the wind force will strengthen the exchange between the warm water layer on the surface of the reservoir and the lower water body. The surface water temperature decreases, the bottom water temperature increases, and the water temperature increases simultaneously, which weakens the temperature stratification to a certain extent.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TV697.21

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