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The Influence of River Channel Occupation on Urban Inundation and Sedimentation Induced by Floodwater in Mountainous Areas: A Case Study in the Loess Plateau, China

Author

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  • Zhihui Wang

    (Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, China
    Key Laboratory of the Loess Plateau Soil Erosion and Water Process and Control, Ministry of Water Resources, Zhengzhou 450003, China
    Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China)

  • Wenyi Yao

    (Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, China
    Key Laboratory of the Loess Plateau Soil Erosion and Water Process and Control, Ministry of Water Resources, Zhengzhou 450003, China)

  • Ming Wang

    (Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, China
    Key Laboratory of the Loess Plateau Soil Erosion and Water Process and Control, Ministry of Water Resources, Zhengzhou 450003, China)

  • Peiqing Xiao

    (Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, China
    Key Laboratory of the Loess Plateau Soil Erosion and Water Process and Control, Ministry of Water Resources, Zhengzhou 450003, China)

  • Jishan Yang

    (Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, China
    Key Laboratory of the Loess Plateau Soil Erosion and Water Process and Control, Ministry of Water Resources, Zhengzhou 450003, China)

  • Pan Zhang

    (Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, China
    Key Laboratory of the Loess Plateau Soil Erosion and Water Process and Control, Ministry of Water Resources, Zhengzhou 450003, China)

  • Qiuhong Tang

    (Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China)

  • Xiangbing Kong

    (Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, China
    Key Laboratory of the Loess Plateau Soil Erosion and Water Process and Control, Ministry of Water Resources, Zhengzhou 450003, China)

  • Jie Wu

    (Hydrology and Water Resources Institute, Hohai University, Nanjing 210000, China)

Abstract

River channel occupation has made cities in the mountainous areas more vulnerable to floodwater out of river channels during rapid global urbanization. A better understanding of the influence of river channel occupation on urban flood disasters can serve as a reference in planning effective urban flood control strategies. In this study, taking a flood event that occurred on July 26th, 2017 in a city on the Loess Plateau as an example, field surveys, dynamics detection of the river channel using remote sensing technology, and scenario simulations with a two-dimensional flow and sediment model were utilized to quantitatively analyze the impacts of river channel occupation on urban inundation and sedimentation. The results show that river channel dynamics reduced by construction can be successfully detected using the combination of high-resolution images and Landsat time-series images. The variation of the water level–discharge relationship caused by the narrowing of the river channel and the increase of the flood-water level caused by water-blocking bridges/houses result in a significant reduction of the flood discharge capacity. The contribution of the narrowing of the river channel was 72.3% for the total area inundated by floodwater, whereas 57.2% of urban sedimentation was caused by the construction of bridges/houses within the river channel. Sustainable flood mitigation measures were also recommended according to the investigations and research findings in this study in order to reduce the social, environmental and economic damages caused by floods.

Suggested Citation

  • Zhihui Wang & Wenyi Yao & Ming Wang & Peiqing Xiao & Jishan Yang & Pan Zhang & Qiuhong Tang & Xiangbing Kong & Jie Wu, 2019. "The Influence of River Channel Occupation on Urban Inundation and Sedimentation Induced by Floodwater in Mountainous Areas: A Case Study in the Loess Plateau, China," Sustainability, MDPI, vol. 11(3), pages 1-19, February.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:3:p:761-:d:202551
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    References listed on IDEAS

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    2. Helena M. Ramos & Mohsen Besharat, 2021. "Urban Flood Risk and Economic Viability Analyses of a Smart Sustainable Drainage System," Sustainability, MDPI, vol. 13(24), pages 1-13, December.

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