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椒江河口挟沙能力经验公式在其河床冲淤预测中的应用

Application of Empirical Formula of Sediment Transport Capacity in Forecast of Riverbed Erosion and Deposition of Jiaojiang River Estuary
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摘要 为计算椒江河口的挟沙能力,依据近年来的水文泥沙实测资料,从"背景含沙量"概念入手,结合水流紊动作用与泥沙重力作用的对比关系,得出了适用于椒江河口的挟沙能力经验式。运用该式预测了短期内河床的冲淤趋势,并将预测结果与实测及数模计算数据进行了比较。结果表明,椒江河口背景含沙量的形成是由最大浑浊带的存在、潮波作用以及悬、底沙在径、潮流作用下频繁交换等几个因素引起;引入"背景含沙量"的挟沙能力经验式可较好地计算椒江河口的挟沙能力,可用于预测河床冲淤趋势,计算结果与实测情况基本一致。研究成果可用于椒江河口的河床冲淤估算,并为类似河口的闸下淤积预估提供了参考。 Based on the concept of 'Background Sediment Concentration and the relationship between flow turbulence and sediment gravity, an empirical formula of sediment transport capacity is established by analyzing the observation data of hydrology and sediment in Jiaojiang River estuary in recent years. The short-term erosion and deposition trend was predicted by employing the empirical formula. The forecast results were compared with the data of situ measurement and numerical model calculation. The research results indicate that the existence of the maximum turbidity, the effect of tidal wave and the frequent exchange between the suspended sediment and bottom sediment under the influence of runoff and tide are the critical factors of causing the formation of background sediment concentrations the empirical formula with the addition of ' Background Sediment Concentration' can be used to calculate the sediment transport capacity and forecast the erosion and deposition trend in Jiaojiang River estuary. The calculation result and the actual measurement are consistent qualitatively and similar quantitatively. The research results would be employed to estimate the erosion and deposition de gree of Jiaojiang River estuary and provide some reference for forecasting the downstream silting degree of sluices in the similar estuary.
作者 夏威夷 赵晓冬 张新周 XIA Wei-yi, ZHAO Xiao-dong, ZHANG Xin-zhou (Key Laboratory of Port, Waterway and Sedimentation Engineering of the Ministry of Transport, Nanjing Hydraulic Research Institute, Nanjing 210024, China)
出处 《水电能源科学》 北大核心 2017年第1期101-103,共3页 International Journal Hydroelectric Energy
基金 水利部公益性行业科研专项经费项目(201201070) 交通运输部重大科技专项项目(201132874640)
关键词 椒江河口 挟沙能力 经验公式 背景含沙量 冲淤预测 Jiaojiang River estuary sediment transport capacity empirical formula background sediment concentra-tion erosion and deposition forecast
作者简介 夏威夷(1988-),男,博士研究生,研究方向为河口动力学及泥沙运动,E-mail:335056446@qq.com 通讯作者:赵晓冬(1964-),男,教授级高级工程师,研究方向为河口动力学及河口整治,Email:xdzhao@nhri.cn
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