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The Role Of Relative Slope Length In Flood Hazard Mapping Using Ahp And Gis (Case Study: Lam River Basin, Vietnam)

https://doi.org/10.24057/2071-9388-2020-48

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Abstract

In addition to the five main factors affecting the formation of floods including slope, rainfall, drainage density, soil, and land cover, the relative slope length factor has also been considered to be one of the fundamental causes that contribute to flood hazard. The paper analyzes the theoretical basis for choosing the relative slope length criterion when zoning flood hazard in Lam river basin. The important role of this factor was evaluated by the results of the flood risk zoning map established by the method of integrating AHP and GIS technology in two cases: using 5 flood influence criteria and using 6 flood influence criteria. Flood hazard zoning maps for 2 cases were tested with 3 historic floods occurring on Oct 2010, Oct 2013 and Oct 2016. The results showed that the map established with six influence factors is more detailed and accurate than the one created with five factors affecting flood hazard because of the similarity with the reality of that map. The results of the study are applicable to other river basins which their geographical features are similar to characteristics the Lam river basin.

About the Authors

Ba Dung Nguyen
Hanoi University of Natural Resources and Environment
Viet Nam
Hanoi


Dang Tuyet Minh
Thuyloi University
Viet Nam
Hanoi


Adeel Ahmad
University of the Punjab
Pakistan

Department of Geography

Lahore



Quoc Long Nguyen
Hanoi University of Mining and Geology
Viet Nam
Hanoi


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For citation:


Nguyen B., Minh D., Ahmad A., Nguyen Q. The Role Of Relative Slope Length In Flood Hazard Mapping Using Ahp And Gis (Case Study: Lam River Basin, Vietnam). GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY. 2020;13(2):115-123. https://doi.org/10.24057/2071-9388-2020-48

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ISSN 2071-9388 (Print)
ISSN 2542-1565 (Online)