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Fuzzy AHP for drought risk assessment in Lam Ta Kong watershed, the north-eastern region of Thailand

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  • Saowanee WIJITKOSUM

Abstract

Droughts occur from a combination of natural factors and human activities rather than just a single natural cause. Spatial factors have also heavily influenced the causes of draught. This study was conducted in the Lam Ta Kong watershed, Thailand. In this study, the Fuzzy Analytic Hierarchy Process (FAHP) method was applied to evaluate the risk of agricultural drought and the GIS technique was employed to give full consideration to the ambiguity and uncertainty of the agricultural drought risk. There are five risk factors to consider in the agricultural drought risk assessment and they are divided in a total of fifteen criteria: physical factors (slope gradient and elevation), climatic (rainfall and aridity index), soil (texture, drainage, fertility, erosion, and soil salinity), land utilization (land use and land cover) and water resources (precipitation days, stream density, distance from an irrigation canal, and groundwater volume). These criteria determine the weight and score used to evaluate their parental risk factors. The Analytic Hierarchy Process (AHP) was applied together with the triangular fuzzy numbers (TFNs) method to assess the data obtained from the criteria to achieve the drought risk assessment. The results indicated that the overall risk of the Lam Ta Kong area was at a moderate risk of agricultural drought (50.45%), of which 15.63% of the total area was at a high risk of agricultural drought. Moreover, 0.40% of the total area located at the central part of the watershed was at a very high risk which was due to its saline soil with > 50% dense salt crust. This research indicated that the major factors causing droughts in the watershed were related to the soil factors, especially soil texture, soil fertility and soil salinity. These soil factors were considered as the driving factors of drought. The results of this study can be used for land use planning and water resource management in order to prepare for droughts in the watershed.

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  • Saowanee WIJITKOSUM, 2018. "Fuzzy AHP for drought risk assessment in Lam Ta Kong watershed, the north-eastern region of Thailand," Soil and Water Research, Czech Academy of Agricultural Sciences, vol. 13(4), pages 218-225.
    • Handle: RePEc:caa:jnlswr:v:13:y:2018:i:4:id:158-2017-swr
    DOI: 10.17221/158/2017-SWR
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    References listed on IDEAS

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    1. Saowanee WIJITKOSUM, 2012. "Impacts of land use changes on soil erosion in Pa Deng sub-district, adjacent area of Kaeng Krachan National Park, Thailand," Soil and Water Research, Czech Academy of Agricultural Sciences, vol. 7(1), pages 10-17.
    2. Xiao-ling Yang & Jie-hua Ding & Hui Hou, 2013. "Application of a triangular fuzzy AHP approach for flood risk evaluation and response measures analysis," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 68(2), pages 657-674, September.
    3. Peter M. Cox & Phil P. Harris & Chris Huntingford & Richard A. Betts & Matthew Collins & Chris D. Jones & Tim E. Jupp & José A. Marengo & Carlos A. Nobre, 2008. "Increasing risk of Amazonian drought due to decreasing aerosol pollution," Nature, Nature, vol. 453(7192), pages 212-215, May.
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    1. Yiqing Sun & Zhenzhong Shen & Weihua Fang & Jiaao Yu & Lei Gan & Liqun Xu & Runying Wang & Hongwei Zhang & Ruiwen Liu & Congcong Zhou & Zhangxin Huang, 2024. "Evaluation of ecologically clean small watersheds in the Yangtze river estuary area of China," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 26(10), pages 26147-26170, October.

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