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Rapid Prediction Model for urban floods Based on a Light Gradient Boosting Machine Approach and Hydrological–Hydraulic Model

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International Journal of Disaster Risk Science 2023年第1期14卷 79-97页

作者： Kui Xu Zhentao Han Hongshi Xu Lingling Bin State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin300350China Yellow River Laboratory Zhengzhou UniversityZhengzhou450001China School of Geographic and Environmental Sciences Tianjin Normal UniversityTianjin300387China

Global climate change and sea level rise have led to increased losses from *** prediction of floods is essential to mitigating flood losses in coastal *** based models cannot satisfy the demand for real-time prediction for urban flooding due to their computational *** this study,we proposed a hybrid modeling approach for rapid prediction of urban floods,coupling the physically based model with the light gradient boosting machine(LightGBM)model.A hydrological–hydraulic model was used to provide sufficient data for the LightGBM model based on the personal computer storm water management model(PCSWMM).The variables related to rainfall,tide level,and the location of flood points were used as the input for the LightGBM *** improve the prediction accuracy,the hyperparameters of the LightGBM model are optimized by grid search algorithm and K-fold *** Haidian Island,Hainan Province,China as a case study,the optimum values of the learning rate,number of estimators,and number of leaves of the LightGBM model are 0.11,450,and 12,*** Nash-Sutcliffe efficiency coefficient(NSE)of the LightGBM model on the test set is 0.9896,indicating that the LightGBM model has reliable predictions and outperforms random forest(RF),extreme gradient boosting(XGBoost),and k-nearest neighbor(KNN).From the LightGBM model,the variables related to tide level were analyzed as the dominant variables for predicting the inundation depth based on the Gini index in the study *** proposed LightGBM model provides a scientific reference for flood control in coastal cities considering its superior performance and computational efficiency.

关键词： China Flood prediction Hainan Hydrological-hydraulic model Light gradient boosting machine urban floods

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Methodological Proposition of an Integrated System for urban floods Control

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Journal of Environmental Science and Engineering(B) 2012年第8期1卷 971-981页

作者： Priscila Dionara Krambeck Braun Carlos Loch Laboratory of Fhotogrametry Remote Sensing and Geoprocessament University Federal of Santa Catarina Florianopolis 88040-900 Brazil

In the State of Santa Catarina, Brazil, especially in the Itajai valley, there are records of accidents and disasters mainly associated to landslides and floods, which have caused significant damages and losses, including human lives. In order to make the coexistence with such natural disasters possible, most particularly with floods, a integration is required among the technical, political, environmental, and human knowledge. Measures that encompass integrated actions for the entire river basin, with the help from an updated technical cadastre and tools, such as the GIS, allow the development of planning tools that might effectively help the people to live with the water, or else to cope with floods in a more appropriate manner. This paper attempts to propose a methodology for urban flood control, based on the integration among the several public entities involved in the flood control, along with the CTM （Multipurpose Technical Cadastre） and GIS tool. In order to solve or minimize the problems, the model proposed here aims at promoting a balance between the agents involved, and enables to rank the degrees of importance assigned to the different needs, thus allowing to eliminate or to improve those areas and processes that are duplicated or superimposed.

关键词： Flood control urban floods methodological proposition.

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Rainwater harvesting systems: An urban flood risk mitigation measure in arid areas

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Water Science and Engineering 2023年第3期16卷 219-225页

作者： Rouya Hdeib Marwan Aouad Department of Civil and Architectural Engineering Applied Science UniversityManamaKingdom of Bahrain

Rainwater harvesting (RWH) systems have been developed to compensate for shortage in the water supply worldwide. Such systems are not very common in arid areas, particularly in the Gulf Region, due to the scarcity of rainfall and their reduced efficiency in covering water demand and reducing water consumption rates. In spite of this, RWH systems have the potential to reduce urban flood risks, particularly in densely populated areas. This study aimed to assess the potential use of RWH systems as urban flood mitigation measures in arid areas. Their utility in the retention of stormwater runoff and the reduction of water depth and extent were evaluated. The study was conducted in a residential area in Bahrain that experienced waterlogging after heavy rainfall events. The water demand patterns of housing units were analyzed, and the daily water balance for RWH tanks was evaluated. The effect of the implementation of RWH systems on the flood volume was evaluated with a two-dimensional hydrodynamic model. Flood simulations were conducted in several rainfall scenarios with different probabilities of occurrence. The results showed significant reductions in the flood depth and flood extent, but these effects were highly dependent on the rainfall intensity of the event. RWH systems are effective flood mitigation measures, particularly in urban arid regions short of proper stormwater control infrastructure, and they enhance the resilience of the built environment to urban floods.

关键词： Rainwater harvesting urban floods Flood map Hydrodynamic model Built environment Arid areas

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NUMERICAL　SIMULATION　OF　INUNDATION　IN　SHENZHEN　CITY　BY　FINTE　DIFFERENCE　MODEL　MIXED　WITH　1D　AND　2D　UNSTEADY　FLOW

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International Journal of Sediment Research 1994年第3期 17-26页

作者： CHENG Xiaotao and QIU Jinwei(, Research Center on Disaster and Environment, China institute of Water Resources and Hydropower Research IWHR)(Research Center on Disaster and Environment, Chian Institute of Water Resources and Hydropower Research IWHR)

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ＮＵＭＥＲＩＣＡＬＳＩＭＵＬＡＴＩＯＮＯＦＩＮＵＮＤＡＴＩＯＮＩＮＳＨＥＮＺＨＥＮＣＩＴＹＢＹＦＩＮＴＥＤＩＦＦＥＲＥＮＣＥＭＯＤＥＬＭＩＸＥＤＷＩＴＨ１ＤＡＮＤ２ＤＵＮＳＴＥＡＤＹＦＬＯＷ￥ＣＨＥＮＧＸｉａｏｔａｏ；ａｎｄＱＩＵＪｉｎｗｅｉ（Ｓｅｎ...

关键词： Unsteady flow numerical model urban floods

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