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

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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

Dang Tuyet Minh
Thuyloi University
Viet Nam

Adeel Ahmad
University of the Punjab

Department of Geography


Quoc Long Nguyen
Hanoi University of Mining and Geology
Viet Nam


1. Bagarello V. and Ferro V. (2010). Analysis of soil loss data from plots of differing length for the Sparacia experimental area, Sicily, Italy. Biosystems Engineering, [online]. 105(3), 411-422. Available at: [Accessed March 2010].

2. Bagio B., Bertol I., Wolschick H.N., Schneiders D., Santos M.A.D.N.D. (2017). Water Erosion in Different Slope Lengths on Bare Soil. Revista Brasileira de Ciência do Solo, [online]. 41. Available at: [Accessed 09 March 2017].

3. Bastawesy M. El., White K. & Nasr A. (2009). Integration of remote sensing and GIS for modelling flash floods in Wadi Hudain catchment, Egypt. Hydrological Processes, [online]. 23(9), 1359-1368, DOI: 10.1002/hyp.

4. Bhushan N. and Rai K. (2004). Strategic Decision Making: Applying the Analytic Hierarchy Process; Springer: London, UK.

5. Chau V.N., Holland J., Cassells S., Tuohy M. (2013). Using GIS to map impacts upon agriculture from extreme floods in Vietnam. ApplIed Geography. [online] 41, 65-74. Available at: [Accessed July 2013].

6. Chinh L., Meding J. (2018). A Flood Risk Assessment of Quang Nam, Vietnam Using Spatial Multicriteria Decision Analysis. Water. [online] 10(4), 461. Available at: [Accessed 8 April 2018].

7. Directorate for Roads of Vietnam, TCVN 9845:2013. (2013). Calculating of flood flow characteristics (in Vietnamese with English summary). Available at: [Accessed 20 May 2020].

8. Dung N.B., Minh D.T., Long N.Q., Ha L.T.T. (2020). Weights of factors contributing to flood formation in the Lam river basin, Vietnam. Journal of Southwest Jiaotong University, 55(2). Available at: [Accessed April 2020].

9. El Alfy M. (2016). Assessing the impact of arid area urbanization on flash floods using GIS, remote sensing, and HEC-HMS rainfall-runoff modeling. Hydrology Research. [online] 47(6), 1142-1160, DOI: 10.2166/nh.2016.133.

10. Elkhrachy I. (2015). Flash Flood Hazard Mapping Using Satellite Images and GIS Tools : A case study of Najran City , Kingdom of Saudi Arabia ( KSA ). The Egyptian Journal of Remote Sensing and Space Sciences. [online] 18(2), 261-278, DOI: 10.1016/j.ejrs.2015.06.007.

11. Gilley J.E, Finkner S.C., Varvel G.E. (1987). Slope Length and Surface Residue Influences on Runoff and Erosion. Biological Systems Engineering: Papers and Publications, 148-152. Available at: [Accessed 20 May 2020].

12. Kandilioti G. and Makropoulos C. (2012). Preliminary flood risk assessment. The case of Athens. Natural Hazards. [online] 61(2), 441-468. Available at: [Accessed 20 May 2020].

13. Kazakis N., Kougias I. & Patsialis T. (2015). Science of the Total Environment Assessment of fl ood hazard areas at a regional scale using an index-based approach and Analytical Hierarchy Process : Application in Rhodope – Evros region, Greece. Science of the Total Environment. [online] 538, 555-563, DOI: 10.1016/j.scitotenv.2015.08.055.

14. Kinnell P.I.A. (2000). The Effect of Slope Length on Sediment Concentrations Associated with Side-Slope Erosion. Soil Science Society of America Journal. [online] 64, 1004-1008. Available at: [Accessed December 1999].

15. Kieu T.D. (2011). Research on large flood management in the Lam River basin, Ph.D. Thesis, Thuyloi University (in Vietnamese with English summary).

16. Lappas I. and Kallioras A. (2019). Flood Susceptibility Assessment through GIS-Based Multi-Criteria Approach and Analytical Hierarchy Process (AHP) in a River Basin in Central Greece. International Research Journal of Engineering and Technology (IRJET). [online] 6(3), 738-751. Available at: [Accessed 3 March 2019].

17. Liu Q.Q. and Singh.V.P. (2004). Effect of Microtopography, Slope Length and Gradient, and Vegetative Cover on Overland Flow through Simulation. Journal of Hydrologic Engineering. [online] 9(5), 375-382, DOI: 10.1061/(ASCE)1084-0699(2004)9.

18. Luu C., Von Meding J., Kanjanabootra S. (2018). Assessing flood hazard using flood marks and analytic hierarchy process approach: A case study for the 2013 flood event in Quang Nam, Vietnam. Natural Hazards. [online] 90, 1031-1050. Available at: [Accessed November 2017].

19. Minh D.T. (2017a). Modeling methods and application for building a flood hazard zoning model. Journal of Mining and Earth Science, 58(4), 128-135 (in Vietnamese with English summary).

20. Minh D.T. (2017b). The application of GIS technology in establishing a land cover hierarchy map for zoning flood hazard in Lam river basin. Mining Industry Journal, 5, 37-40 (In Vietnamese with English summary).

21. Minh D.T. (2017c). The application of GIS technology to build a soil classification map following level of flood risk in Lam river basin. Journal of Science on Natural Resources and Environment, 16, 68-74 (in Vietnamese with English summary).

22. Minh D.T. (2019a). Application of GIS technology to establish a drainage density hierarchical map for flood hazard zoning in Lam river basin. Journal of Mining and Earth Sciences, 59(6), 32-42 (in Vietnamese with English summary).

23. Minh D.T. (2019b). Research on the application of special modeling in zoning flood hazard in flood warning in lam river basin, Ph.D. thesis, university of mining and geology (in Vietnamese with English summary).

24. Minh D.T and Dung N.B. (2017). Flood Hazard zoning in Lam river basin, Vietnam, using GIS and analytic hierarchy process (AHP). Proceedings of International Conference on Geo-Spatial Technologies and Earth Resources, 837-843.

25. Ministry of Science and Technology. (2009). Soil quality – Method for determination of soil erosion by rain. National Standards TCVN 5299: 2009, (in Vietnamese). Available at: [Accessed 20 May 2020].

26. Myronidis D., Emmanouloudis D., Stathis D., Stefanidis P. (2009). Integrated flood hazard mapping in the framework of E.U directive on the assessment and management of flood risks. Fresenius Environ Bull. [online] 18(1), 102-111. Available at: [Accessed 20 May 2020].

27. Paweł C. (2010). Using the analytic hierarchy process in evaluating decision alternative. Operations research and decisions. [online] 1. Available at: [Accessed 20 May 2020].

28. Phuong T.T., Minh P.T., Ngoc N.B. (2015). Application GIS and AHP to build the flood hazard zoning map in the Huong River basin, Thua Thien Hue province. Hue University Journal of Science. [online] Volume 13(112) (in Vietnamese). Available at: [Accessed 20 May 2020].

29. Radwan F., Alazba A.A. & Mossad, A. (2019). Flood risk assessment and mapping using AHP in arid and semiarid regions. Acta Geophysica, [online] 67(1), 215-229, DOI: 10.1007/s11600-018-0233-z.

30. Rahmati O., Zeinivand H. & Besharat M. (2016). Flood hazard zoning in Yasooj region, Iran, using GIS and multi-criteria decision analysis. Geomatics, Natural Hazards and Risk. [online] 7(3), 1000-1017, DOI: 10.1080/19475705.2015.1045043.

31. Saaty T.L. (2012). Decision making in complex enviroments:The Analytic Network Process (ANP) for Dependence and Feedback. Pittsburgh. Available at: [Accessed 20 May 2020].

32. Seejata K., Yodying A., Wongthadam T., Mahavik N. & Tantanee S. (2018). Assessment of flood hazard areas using Analytical Hierarchy Process over the Lower Yom Basin, Sukhothai Province. Procedia Engineering. [online] 212, 340-347, DOI: 10.1016/j.proeng.2018.01.044.

33. Souissi D., Zouhri L., Hammami S., Msaddek M. H., Zghibi A. & Dlala M. (2019). GIS-based MCDM–AHP modeling for flood susceptibility mapping of arid areas, southeastern Tunisia. Geocarto International. [online] 1-27, DOI: 10.1080/10106049.2019.1566405.

34. Tran P., Marincioni F., Shaw R., Sarti M., Van An L. (2008). Flood risk management in Central Vietnam: Challenges and potentials. Natural Hazards, 46(1), 119-138. Available at:

35. Tu L.H., Hong N.T., Liem N.D., Loi N.K. (2013). Integrating Analytic Hierarchy Process and GIS for Flood risk zoning in Vu Gia Watershed, Quang Nam Province, VNU Journal of Science. [online] 3(29), 64-72 (in Vietnamese with English summary).

36. Vojtek M. & Vojteková J. (2019). Flood susceptibility mapping on a national scale in Slovakia using the analytical hierarchy process. Water (Switzerland). [online] 11(2), DOI: 10.3390/w11020364.

37. Yongmei D., Xihuan S., Xianghong G., Shijun N. & Juanjuan M. (2011). Analysis of Slope Length on Water Soil Erosion. International Conference on Consumer Electronics, Communications and Networks, CECNet. [online] 2943-2946, DOI: 10.1109/CECNET.2011.5769391.

38. Zhang H., Wei J., Yang Q., Baartman J.E.M., Gai L., Yang X., et al. (2017). An improved method for calculating slope length (λ) and the LS parameters of the Revised Universal Soil Loss Equation for large watersheds. Geoderma. [online] 308, 36-45. Available at: [Accessed 15 December 2017].

39. Wischmeier W.H. and Smith D.D. (1978). Predicting rainfall erosion losses: a guide toconservation planning with Universal Soil Loss Equation (USLE) Agriculture Handbook, Department of Agriculture, Washington, DC. (703). Available at: [Accessed 20 May 202].

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.

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