Next Article in Journal
Application of Remote Sensing Methods to Study the Relief of Lowland River Valleys with a Complex Geological Structure—A Case Study of the Bug River
Previous Article in Journal
Performance Behavior of Participatory Water Institutions in Eastern India: A Study through Structural Equation Modelling
Open AccessArticle

A Method for Dynamical Sub-Watershed Delimitating by No-Fill Digital Elevation Model and Defined Precipitation: A Case Study of Wuhan, China

1
Faculty of Information Engineering, China University of Geosciences, Wuhan 430074, China
2
Faculty of Information Engineering, Wuhan University of Engineering Science, Wuhan 430200, China
3
College of Geophysics and Petroleum Resources, Yangtze University, Wuhan 434023, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(2), 486; https://doi.org/10.3390/w12020486
Received: 26 December 2019 / Revised: 31 January 2020 / Accepted: 8 February 2020 / Published: 11 February 2020
(This article belongs to the Section Urban Water Management)
Watershed delimitation is very important in flood control management. The traditional sub-watersheds delimitated by a filling digital elevation model (DEM) may change the real sink area, such that it may not be the best choice in studies sensitive to sub-watershed storage. This paper proposes a dynamical watershed delimitation method using a no-fill DEM and precipitation. It considers a closed sink area containing cells that fully flow into a large special cell, which can flow out when its water level is “higher than outlet”. We took Wuhan City as a study area and defined the precipitation in return periods of 1, 5, 20, or 100 years to derive the sub-watersheds. It is found that, in the four delimitations, the ratio of isolated basic units which could not flow outside were 27%, 9%, 5%, and 1%, respectively, as the precipitation increased. The results show that the provided method satisfies the assumption that the sink area might overflow with increased precipitation. The sub-watershed delimitated by the proposed method has higher correlation with the distribution of waterlogging points than those delimitated according to the D8 algorithm. These findings indicate that the proposed method can derive reasonable sub-watershed delimitation and that it may be helpful in the practice of urban flood control management.
Keywords: urban flood; source flood; watershed delimitation; sink area; flow direction algorithm urban flood; source flood; watershed delimitation; sink area; flow direction algorithm
MDPI and ACS Style

Zhang, H.; Cheng, X.; Jin, L.; Zhao, D.; Feng, T.; Zheng, K. A Method for Dynamical Sub-Watershed Delimitating by No-Fill Digital Elevation Model and Defined Precipitation: A Case Study of Wuhan, China. Water 2020, 12, 486.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop