MainDBDraft: Impacts of land-use changes on the groundwater recharge in Ho Chi Minh city, Vietnam
Title:
Impacts of land-use changes on the groundwater recharge in Ho Chi Minh city, Vietnam
Geographic region:
Asia
Target group:
Academics and scientists; Policy makers; Practitioners
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Date of submission:
01/10/2020
Further information:
Please contact Linda Stevenson at lastevenson@apn-gcr.org and/or Sangam Shrestha at sangam@ait.asia
NWPPartner:
Asia-Pacific Network for Global Change Research
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Geographic scope:
National
Adaptation element:
Impact assessment
Adaptation sector/theme:
Urban resilience; Water resources
Climate hazard:
Erratic rainfall; Increasing temperatures
Implementing partners:
Water Engineering and Management, School of Engineering and Technology, Asian Institute of Technology Asia-Pacific Network for Global Change Research (APN)
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Type of organization:
Civil society
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Country:
Vietnam
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Based on the changed land-use, the SWAT model was used to estimate the future recharge in the three scenarios that were developed. The recharge was observed to increase by a maximum of 15% of the annual average in the low urbanization scenario while it was observed to reduce by a maximum of 30.21% of the annual average in medium urbanization scenario. In the high urbanization scenario, the majority of HCMC is expected to be covered in built-up area which will have a significant impact on the groundwater recharge in HCMC with a maximum decrease of 52.15% in the average annual recharge in far future. Thus, a significant impact on the groundwater recharge was observed in HCMC due to changes in the impervious built-up area. Therefore, a rigid regulation on land-use planning in terms of high urbanization in the future should be followed in HCMC to minimize the effect of high urbanization on the groundwater recharge and other environmental consequences.
References NWP:
Adhikari, R. K., Mohanasundaram, S., & Shrestha, S. (2020). Impacts of land-use changes on the groundwater recharge in the Ho Chi Minh city, Vietnam. Environmental Research, 185, 109440. doi: 10.1016/j.envres.2020.109440
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NWPTypeOfKnowledge:
Technical document/report
Description:
Ho Chi Minh City (HCMC), Vietnam has undergone tremendous transformation in land-use practices in the past few decades. The groundwater-related issues have also been a major concern in the fast-growing southern city of Vietnam. Quantitative prediction of the impact on groundwater recharge due to changes in the land-use pattern of a watershed is crucial in developing sound groundwater management schemes. This study aims to evaluate the impacts of change in land-use patterns on the quantity of groundwater recharge in HCMC. An empirical land-use projection model (Conversion of Land-use and its Effects, Dyna-CLUE) and a hydrological model (Soil and Water Assessment Tool, SWAT) was used for the study.
Outcome:
Three future land-use scenarios of Low Urbanization Scenario (LU), Medium Urbanization Scenario (MU) and High Urbanization Scenario (HU) were developed in Dyna-CLUE focusing on the increase of built-up area to generate land-use maps of HCMC until the year 2100. The land-use maps for all three scenarios were then used in the calibrated hydrological model SWAT to get the future recharge in the near future (2016–2045), mid future (2046–2075) and far future (2076–2100). The recharge was observed to increase in the far future of LU by 10% while reduction of 30% and 52% in annual average recharge was observed in far future of MU and HU respectively. It was, thus, observed that change in the built-up area has a significant effect on the groundwater recharge in HCMC.
NWPInformationType:
Case study
NWPStatus:
Processed
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Created at 01/10/2020 04:34 by
Last modified at 01/10/2020 04:35 by crmmocservices
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