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潮汐河口汊道治理数值模拟研究(何杰)

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潮汐河口汊道治理数值模拟研究

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J2k OE5[uJ0【作者】何杰 【导师】辛文杰
9rb$Vo d:w"T f0【作者基本信息】南京水利科学研究院,港口、海岸及近海工程,2006年,硕士

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8L$o[ MD`/cO.fB1Z0【中文摘要】 河口地区受径流潮流等多种因素控制,水流运动复杂,分汊河口作为河口的一个重要组成部分,既有河口的共性又有自身的特点。河口汊道治理方式不同于单一河道,应把分汊河道与相邻水域作为一个整体进行系统地分析。在对河口动力特性分析的基础上,根据分汊河口的特点概化出河口汊道的单一分汊、对称分布的一般地形。 通过数学模型对整治和疏浚两种方式工程前后的水流运动进行模拟计算并比较。研究结果表明:单对丁坝只能提高丁坝附近范围的流速,且流向改变较大,坝后回流区范围较大;丁坝群可有效提高治理汊道内流速,流向变化小,但对分流比影响较大;疏浚增加了治理汊道内的水深,对分流比影响较小,而流速增加不明显;整治使汊道的局部地区流速提高,疏浚则是提高整个汊道的过流能力;整治与疏浚相结合的优化方案在保留前两种方案的优点的同时削弱了部分缺点,丁坝群使边滩水流归入主槽,挖深后的河槽增加了汊道的过流能力,即在增加水深的同时,分流比影响不大,而流速也有明显提高,可作为河口汊道治理的一种优选方式。

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k k$a5N`g;DL?o0【英文摘要】 The current flowing in estuary controlled by stream and tide is very complex. As one important composed part in estuary, bifurcated estuary has not only the commonness of estuary but also its characteristic. The regulation for bifurcated estuary is differ from that of single river, and the bifurcated river with conjoint water area are to be considered to systems analysis as whole. Based on the hydrodynamic analysis to the estuary, an general estuary inlet is proposed by bifurcated characteristic with single bifurcating and symmetrical distributing.The current flowing is simulated by the mathematical model after regulating or dredging in the estuary inlet. The calculation shows, a pair of spur dikes can only increase the flow velocity near area, but the flow direction and the re-circulation length are changed more than ever. The flow velocity could be improved in the regulated inlet by series spur dikes, and the flow direction's change is very little, but the infection to discharge rati...更多o is more large. The dredging can increase the depth of regulated inlet directly, and the infection to discharge ratio is very little, but the flow velocity isn't improved evidently. Regulating increases the flow velocity in part of the estuary inlet, but dredging could improve the ability of crossing flow. When regulating and dredging applied coexistent, it has the advantage of regulating and dredging and makes some disadvantage weakened. The water flow is concentrated to main channel from river beach, and the flowing ability is improved after the river bed dredged. As a result, the method of regulating and dredging is one better way for the estuary inlet, with river bed deepened, changing on discharge ratio little and increasing to flow velocity clearly.  还原

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【中文关键词】 河口; 汊道; 数学模型; 丁坝; 疏浚
9};],]bl @q0【英文关键词】 estuary; inlet; mathematical model; spur dike; dredging水利论文P7ktul

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TAG: 潮汐 河口 数值模拟 治理 何杰
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