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Impacts of climate and land use change on hydrodynamics and sediment transport regime of the Ganga River Basin

机译：气候和土地利用变化对甘河流域流体动力学和沉积物制度的影响

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Under climate change and pressure from human activities, extreme flood events are becoming a significant concern. The study involves setting up a coupled hydroclimate-hydrodynamic models over the Ganga River Basin by coupling the CORDEX regional climate models to the physically based Soil Water Assessment Tool-based hydrological model and MIKE 21C-based hydrodynamic model. The coupled model was employed to explore the flood inundation and dynamics of sediment mobilization amid various extreme events under future conditions. The water level, particularly for the 40-year return period for the late century (2061-2100), is estimated to rise in the future (0.9-1.2m). Since extreme streamflow has increased in the future, morphological transformations will also aggravate. Moreover, during the extreme events, the peaks in shear stress and velocity profile distribution have a propensity to coincide with the areas of the meander bend, implying that the river meander processes govern the shifts in the dynamics of the sediment transport. Additionally, the developed model framework has been employed to determine the areas affected and inundation pattern due to the 18 August 2008 flood in the Kosi River due to the embankment breach. Simulation exhibited that there is a good agreement between the simulated and observed inundation areas. Together with the evaluation of the susceptibility corresponding to lives and livelihoods, this information may facilitate decision-makers to develop ameliorative policies and adopt meaningful measures to alleviate the impacts.
机译：在气候变化和人类活动的压力下，极端洪水事件正在成为一个重要的问题。该研究涉及通过将Cordex区域气候模型耦合到基于物理的土壤水分评估工具的水文模型和迈克21C基流体动力学模型，在Ganga River盆地上设立冈河流域的耦合水池 - 流体动力学模型。在未来条件下的各种极端事件中，耦合模型探讨了沉积物动员的洪水淹没和动态。估计未来（2061-2100）的40年来的40年回报期的水位估计（0.9-120万）。由于极端流流量在未来增加，形态转化也会加剧。此外，在极端事件期间，剪切应力和速度曲线分布中的峰具有与曲折弯曲的区域重合的倾向，这意味着河流蜿蜒过程控制沉积物传输的动态中的变化。此外，由于堤防突破，已雇用开发的模型框架以确定受影响和淹没模式的区域和淹没模式。模拟表明，模拟和观察到的淹没区域之间存在良好的一致性。与评估对应于生计和生计的易感性，这些信息可以促进决策者制定改善政策，并采取有意义的措施来缓解影响。

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