Flood inundation modeling and mapping by integrating surface and subsurface hydrology with river hydrodynamics
Flood inundation modeling and mapping by integrating surface and subsurface hydrology with river hydrodynamics
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DOI：
10.1016/j.jhydrol.2019.06.024
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发表时间：
2019-08
影响因子：
6.4
通讯作者：
S. Saksena;V. Merwade;P. Singhofen
中科院分区：
文献类型：
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作者：
S. Saksena;V. Merwade;P. Singhofen
使用一维（1D）和二维（2D）模型进行洪水建模和制图，使我们对河流水力学和水文学的理解取得了重大进展。现有的模拟方法可以通过更好地理解河流水动力和地下过程之间的相互作用来进一步改进。地下和洪泛区的饱和条件可能导致低强度但连续的洪水事件造成更长时间和更深的淹没。为了了解地表-地下水文学和水动力学对洪水期间径流生成和随后的淹没的综合影响，本研究采用综合地表水-地下水（SW-GW）建模方法模拟洪水条件。对美国印第安纳州上瓦巴什河流域一次高洪水事件的模拟表明，采用二维集成SW-GW模型可以更准确地模拟河流-洪泛区水动力，而不需要进行大量的标定。此外，一个综合模型提供了一个更现实的模拟不同的前期土壤条件的洪水流体动力学。具体而言，结果表明，径流量，洪水水位和淹没面积的干燥的情况下获得的显着较低时，饱和的情况。这些研究结果进一步验证了一个完全不同的流域（克罗顿河）在纽约州的综合建模方法。总体而言，这项研究的结果表明，目前的做法，模拟洪水，假设不透水的表面可能无法提供现实的洪水淹没的估计，并在河流系统中的所有水文和水力过程的综合方法必须通过。
Modeling and mapping of floods using one (1D) and two-dimensional (2D) models has resulted in significant progress in our understanding of river hydraulics and hydrology. The existing modeling approach can be improved further through a better understanding of the interactions between river hydrodynamics and subsurface processes. Saturated conditions in subsurface and floodplains can lead to longer and deeper inundation from low intensity but continuous flood events. To understand the combined effect of surface-subsurface hydrology and hydrodynamics on streamflow generation and subsequent inundation during floods, this study uses an integrated surface water-groundwater (SW-GW) modeling approach for simulating flood conditions. Simulation of a high flooding event for the Upper Wabash River basin in Indiana, USA, shows that the river-floodplain hydrodynamics is simulated more accurately without the need for extensive calibration by using a two-dimensional integrated SW-GW model. Additionally, an integrated model provides a more realistic simulation of flood hydrodynamics for different antecedent soil conditions. Specifically, results show that the streamflow, flood stages and inundation area obtained for the dry scenario are significantly lower when compared to the saturated scenario. These findings are further validated by applying the integrated modeling approach for an entirely different watershed (Croton River) in the state of New York. Overall, the findings from this study suggest that the current practice of simulating floods which assumes an impervious surface may not be providing realistic estimates of flood inundation, and that an integrated approach incorporating all the hydrologic and hydraulic processes in the river system must be adopted.