Conjunctive water use modelling considering surface water and groundwater interactions for the Mae Klong river Basin, Thailand

Name: Khalil, Alamgir, 1979-

LCSH: Water-supply -- Management -- Thailand

LCSH: Water resources development -- Thailand

Abstract: This study investigated the application of Water Evaluation And Planning system (WEAP) to evaluate the water supply and demand situations in the Mae Klong River Basin, Thailand using hydro-meteorological data for the period 2000-2015. The simulated results showed that the water resources in the basin are sufficient to meet the existing needs in the wet season, but water shortages have occurred in the dry seasons of 2014 and 2015 which could be attributed to less rainfall in those years. The agricultural unmet demand was 67 MCM/year, and that for water diversion to the Tha Chin Basin was 17 MCM/year, whereas the demand for water supply to Metropolitan Waterworks Authority in Bangkok was fully met. Six scenarios were developed by considering changes in the both supply and demand sides to assess future evolution of the basin. The availability of the groundwater for the Greater Mae Klong Irrigation Project (GMKIP) was assessed by developing a groundwater model. The average pumping rate for government wells was 251.54 m3/day, while that for private wells was 320.67 m3/day. The quantity of groundwater pumped was 347.92 MCM/year or 5.68% of the total irrigation demand. The developed MODFLOW model for GMKIP was connected with WEAP model for evaluating the conjunctive water use options in the area. The percentage share of surface and groundwater supply was based on the pumping wells data. The percentages of surface and groundwater supply to the two sub-irrigation units of GMKIP on the right side of the Mae Klong River were 97.71% and 2.29%, respectively, while those to the eight sub-irrigation units on the left side were 93.11% and 6.89%, respectively. Utilization of both surface and groundwater resources reduced the unmet water demands and increased the reliability of water demands, hydropower generation and minimum streamflow requirements for the period 2000-2015. Multi-objective optimization using genetic algorithm was considered for the irrigation demands in 2015. The average cost of water for irrigation was minimized to 0.24 THB/m3 from 0.39 THB/m3. However, the total unmet demand increased slightly to 380.21 MCM from 366.50 MCM due to the conflicting nature of the two objective functions for this study.

Mahidol University. Mahidol University Library and Knowledge Center

Address: NAKHONPATHOM

Email: liwww@mahidol.ac.th

Name: Areeya Rittima

Role: Thesis Advisors

Name: Ranjna Jindal

Role: Thesis Advisors

Name: Kritsanat Surakit

Role: Thesis Advisors

Name: Yutthana Phankamolsil

Role: Thesis Advisors

Created: 2018

Modified: 2023-08-09

Issued: 2023-08-09

วิทยานิพนธ์/Thesis

application/pdf

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Environmental and Water Resources Engineering

Grantor: Mahidol University

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