This study investigates the role of channelization works on water temperatures in the Vermilion River network located in coastal Louisiana, USA. A physically based one‐dimensional (1D) approach is taken for hydrodynamics and heat exchange in the Vermilion River as an initial step toward understanding the cumulative effects of flood control on riverine water quality and aquatic population dynamics. The model performs acceptably well against available measurements for stage (root mean square deviation [RMSD] = 0.27 m, Nash–Sutcliffe efficiency [NSE] = 0.69—mean) and water temperature (RMSD = 1.6°C, NSE = 0.91—mean) for the purposes of scenario evaluation. Alternative forcing scenarios are developed to assess thermal impact sensitivities to dredge‐type channelization under various atmospheric and headwater boundary conditions. The results suggest that river dredging enhances daily temperature fluctuations in the adjacent swamp while reducing thermal variation in the river. Temperature variation and cumulative effects are also analyzed during critical biological periods at daily time scales as increased temperature fluctuation may increase thermal stress, while net cooling (cumulative temperature reduction) may affect reproduction and growth rates of riverine fish populations. The findings are relevant in the management, protection, and restoration of coastal riverine ecosystems and future modeling of the cumulative ecological effect of river channelization measures.

中文翻译：

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模拟沿海河网中水温对渠道化的响应

这项研究调查了位于美国路易斯安那州沿海的朱红河网中渠道化工程对水温的作用。采取基于物理的一维（1D）方法进行朱砂河中的水动力和热交换，是迈向了解防洪对河流水质和水生种群动态的累积影响的第一步。对于阶段（均方根偏差[RMSD] = 0.27 m，纳什-苏克利夫效率[NSE] = 0.69-平均值）和水温（RMSD = 1.6°C，NSE = 0.91-平均值），该模型的效果令人满意用于场景评估的目的。开发了替代强迫情景，以评估在各种大气和源头边界条件下对挖泥型渠道化的热影响敏感性。结果表明，河道疏s增加了邻近沼泽的每日温度波动，同时减少了河道的热力变化。在每日时间尺度上的关键生物周期内，还分析了温度变化和累积效应，因为温度波动的增加可能会增加热应力，而净冷却（累积温度降低）可能会影响河流鱼类种群的繁殖和生长速度。这些发现与沿海河流生态系统的管理，保护和恢复以及河流渠道化措施的累积生态效应的未来模型相关。在每日时间尺度上的关键生物周期内，还分析了温度变化和累积效应，因为温度波动的增加可能会增加热应力，而净冷却（累积温度降低）可能会影响河流鱼类种群的繁殖和生长速度。这些发现与沿海河流生态系统的管理，保护和恢复以及河流渠道化措施的累积生态效应的未来模型相关。在每日时间尺度上的关键生物周期内，还分析了温度变化和累积效应，因为温度波动的增加可能会增加热应力，而净冷却（累积温度降低）可能会影响河流鱼类种群的繁殖和生长速度。这些发现与沿海河流生态系统的管理，保护和恢复以及河流渠道化措施的累积生态效应的未来模型相关。