World Environmental and Water Resources Congress 2018
Impact of Urbanization on Hydrological Processes: A Case Study of Xinji River in Southern China
Publication: World Environmental and Water Resources Congress 2018: Watershed Management, Irrigation and Drainage, and Water Resources Planning and Management
ABSTRACT
Urbanization has become a global trend over the past century. Urbanization, causing significant changes on watershed land use/cover (LUC) types, changes the hydrological characteristics of urbanized watersheds. Surface peak flow and runoff coefficient are the most impacted hydrological index. The increased peak flow and higher runoff coefficient requires increased flood mitigation capacities. To better adapt to this change, quantitatively determining the effect of urbanization on the hydrological processes is extremely important for watershed planning and management. This article studied the impact of urbanization on the peak flow and runoff coefficient of Xinji River in southern China, a highly urbanized watershed. The Liuxihe model, a physically based, distributed hydrological model proposed for watershed flood forecasting is employed to simulate the flood processes of Xinji River, and the LUCs at 12 time periods derived from satellite remote sensing imagery are used to estimate the model parameters induced by urbanization. The results show that from 1987 to 2015, in less than 30 years, the urban land area of Xinji River increased from 0.8% to 45.1%, a rapid urbanization. Land use change has significantly changed the flood characteristics of Xinji River. The peak flow in 2015 had an average increase of 67.83 m3/s than that in 1987, while the average runoff coefficient increased 0.289.
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ACKNOWLEDGMENT
This study is supported by the National Science & Technology Pillar Program during the Twentieth Five-year Plan Period (funding no. 2015BAK11B02), the Science and Technology Program of Guangdong Province (funding no. 2014A050503031) and the Natural Science Foundation of China (NSFC) (funding no. 51379222).
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Published In
World Environmental and Water Resources Congress 2018: Watershed Management, Irrigation and Drainage, and Water Resources Planning and Management
Pages: 321 - 329
Editor: Sri Kamojjala, Las Vegas Valley Water District
ISBN (Online): 978-0-7844-8140-0
Copyright
© 2018 American Society of Civil Engineers.
History
Published online: May 31, 2018
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