极端溃坝条件下城市景观水体模型试验

发布时间：2018-06-19 23:43

本文选题：缓蓄快放系统 + 城市景观水体　；参考：《西安理工大学》2017年硕士论文

【摘要】：近年来城市景观水体越来越受到人们的青睐,因其具有观赏、娱乐、调节微气候的特点,在城市建设中都有考虑到。但城市景观水体由于水流缓慢、河道较宽、上游来水不足等原因,很容易受到污染,出现水质恶化等问题。不仅影响城市的美观,而且带给周围居民一些不便。对于这个问题,虽然各级政府和部门都在努力解决,但是并没有得出一个有效的方法。本文针对景观水体的特点,提出了一种新的改善和保持景观水体的方法——缓蓄快放系统。来改善城市景观水体的水质。并以西安护城河为原型,通过理论计算、物理模型试验模拟、软件模拟分析缓蓄快放系统前后河道的水力学要素状况,分析了缓蓄快放系统对河道的影响。研究成果对缓解水环境严峻形势和维持水生态系统平衡具有重要的意义i。(1)试验研究不同蓄水深下缓蓄快放系统所产生的水力要素变化,得到了各闸前蓄水深时下游沿程洪水位变化特点,洪水水头推进时长计算式、最高洪水位推进时长计算式、最高洪水位计算式、最高洪水位时流速变化特点。(2)试验研究下游底坎对溃坝水流的影响,得到了下游底坎上游水位变化规律。(3)采用MIKE软件对模型试验中闸门处蓄水深度为0.12m条件下的缓蓄快放系统进行模拟,得到了速度分布云图,并对模拟结果进行分析,同样得到了断面位置与最大水深、最大流量、断面平均流速的关系曲线,对曲线进行回归性分析,得到各断面最大水位、最大水位时的流量、断面平均流速拟合函数,以及各断面流速在横向的变化。(4)以研究成果为基础,在特定河道中建立缓蓄快放系统模拟水力要素变化。
[Abstract]:In recent years, urban landscape water has been more and more popular, because of its characteristics of viewing, entertainment and adjusting microclimate, it has been taken into account in urban construction. However, due to the slow flow of water, wide channel and insufficient upstream water, the urban landscape water body is liable to be polluted and the water quality deteriorates. Not only affect the beauty of the city, but also bring some inconvenience to the surrounding residents. Although governments and departments at all levels are trying to solve this problem, they have not come up with an effective method. According to the characteristics of landscape water body, a new method of improving and maintaining landscape water body, slow storage and fast release system, is put forward in this paper. To improve the water quality of urban landscape water. Taking Xi'an moat as the prototype, through theoretical calculation, physical model test and software simulation, the hydraulic factors of the river before and after the slow storage and releasing system are analyzed, and the influence of the slow storage and release system on the river course is analyzed. The research results have important significance for alleviating the severe situation of water environment and maintaining the balance of water ecosystem. The variation characteristics of flood water level along the downstream, the calculation formula of the length of the propulsive time of the flood head and the calculation formula of the maximum flood water level are obtained when the water storage depth in front of the sluice is deep. The characteristics of velocity variation at the highest flood level.) the influence of the bottom of the lower reaches on the flow of dam-break is studied by experiments. The variation law of water level in the upper reaches of the lower bottom is obtained. Mike software is used to simulate the slow storage and rapid discharge system under the condition of 0.12m storage depth at the gate in the model test, and the velocity distribution cloud map is obtained, and the simulation results are analyzed. The relationship between section position and maximum water depth, maximum discharge and average velocity of section is also obtained. The regression analysis of the curve is carried out, and the fitting function of the maximum water level, the maximum water level and the average flow velocity of each section is obtained. On the basis of the research results, a slow storage system is established to simulate the variation of hydraulic factors.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X52

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