Estuaries and Coasts ( IF 2.3 ) Pub Date : 2021-07-10 , DOI: 10.1007/s12237-021-00981-8 Wei He 1, 2, 3 , Aili Jiang 1, 2, 3 , Jian Zhang 1, 2, 3 , Hui Xu 1, 2, 3 , Yang Xiao 1, 2, 3 , Sheng Chen 1, 2, 3 , Xiaodong Yu 1, 2, 3
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The hydrodynamic conditions of estuary channels are crucial to water exchanges, saltwater intrusions, and sediment movements. A comprehensive hydrodynamic study considering above multi-environmental impacts is imperative for the evaluation of local hydrodynamic strengths and the effects of water diversion projects. Aiming at this, this paper has proposed a comprehensive hydrodynamic fitness (CHF) framework, including the setup of numerical model, the calculation of the satisfactory percentage of a single index (SPSI), and the determination of the CHF. A hydrodynamic-dye-salinity-sediment model based on the finite-volume coastal ocean model (FVCOM) is built to elaborate the CHF using a case study of the Rongjiang River Estuary (RRE), and the effects of a freshwater inflow of 20 m3/s from a water diversion project on the CHF are revealed. The results show that the average turnover time, water salinity, and sediment deposition are 7.10 days, 9.39‰, and − 0.006 m, respectively, for the whole estuary channel in a normal year, and their SPSIs are 34.9%, 57.5%, and 69.4%, respectively. The CHFs are 55.8%, 73.9%, and 35.2% for normal, wet, and dry years, respectively, and these values can increase to 64.0%, 81.3%, and 43.5% with water diversion inflow. As sea level rises by 0.175 m, the CHF decreases from 55.8 to 52.9%, and can increase to 60.4% with water diversion inflow. The effects of the water diversion inflow on the CHF should not be linearly judged by the increase in freshwater runoff. The CHF framework can be extended to lagoons, bays, and reservoirs to support water resource management.
Graphical abstract
中文翻译：
河口河道综合水动力适应性及引水入流影响
河口河道的水动力条件对水交换、咸水入侵和沉积物运动至关重要。考虑到上述多环境影响的综合水动力研究对于评估当地水动力强度和引水工程的影响势在必行。为此，本文提出了一个综合的水动力适应度（CHF）框架，包括数值模型的建立、单一指标的满意百分比（SPSI）的计算以及CHF的确定。建立了基于有限体积沿海海洋模型 (FVCOM) 的水动力-染料-盐度-沉积模型，以利用榕江河口 (RRE) 的案例研究和 20 m 淡水流入的影响来阐述 CHF 3来自 CHF 的引水项目的 /s 显示出来。结果表明，正常年份全河口河道平均周转时间、水体盐度和沉积物沉积量分别为7.10天、9.39‰和-0.006 m，其SPSI分别为34.9%、57.5%和-0.006 m。分别为 69.4%。正常年、湿润年和干旱年的 CHF 分别为 55.8%、73.9% 和 35.2%，随着引水流入，这些值可以增加到 64.0%、81.3% 和 43.5%。随着海平面上升 0.175 m，CHF 从 55.8% 下降到 52.9%，随着引水流入，CHF 可以增加到 60.4%。不应通过淡水径流的增加来线性判断引水流入对 CHF 的影响。CHF 框架可以扩展到泻湖、海湾和水库，以支持水资源管理。
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