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Impacts of land-use changes on the groundwater recharge in the Ho Chi Minh city, Vietnam.
Environmental Research ( IF 8.3 ) Pub Date : 2020-03-31 , DOI: 10.1016/j.envres.2020.109440
Riwaz Kumar Adhikari 1 , S Mohanasundaram 1 , Sangam Shrestha 1
Affiliation  

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. 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 built-up area has a significant effect on the groundwater recharge in HCMC.

中文翻译:

越南胡志明市土地利用变化对地下水补给的影响。

在过去的几十年中,越南胡志明市(HCMC)的土地使用方式发生了巨大变化。在快速发展的越南南部城市越南,与地下水有关的问题也是一个主要问题。定量预测流域土地利用方式变化对地下水补给的影响,对于制定合理的地下水管理计划至关重要。这项研究旨在评估HCMC中土地利用方式的变化对地下水补给量的影响。该研究使用了经验土地利用预测模型(土地利用及其影响的转化,Dyna-CLUE)和水文模型(土壤和水评估工具,SWAT)。低城市化情景(LU)的三种未来土地使用情景,在Dyna-CLUE中开发了中等城市化方案(MU)和高城市化方案(HU),重点是增加建筑面积,以生成HCMC的土地利用图,直到2100年。这三种情况的土地利用图然后将其用于校准的水文模型SWAT中,以获取近期(2016-2045),中期(2046-2075)和遥远的将来(2076-2100)的未来补给。观察到,在遥远的将来,补给量将增加10%,而在MU和HU的不久的将来,年均补给量将分别减少30%和52%。因此,观察到建筑面积的变化对HCMC中的地下水补给有重大影响。然后,在校准的水文模型SWAT中使用了所有这三种情况的土地使用图,以获取近期(2016-2045),中期(2046-2075)和远期(2076-2100)的未来补给。观察到,在遥远的将来,补给量将增加10%,而在MU和HU的不久的将来,年均补给量将分别减少30%和52%。因此,观察到建筑面积的变化对HCMC中的地下水补给有重大影响。然后,在校准的水文模型SWAT中使用了所有这三种情况的土地使用图,以获取近期(2016-2045),中期(2046-2075)和远期(2076-2100)的未来补给。观察到,在遥远的将来,补给量将增加10%,而在MU和HU的不久的将来,年均补给量将分别减少30%和52%。因此,观察到建筑面积的变化对HCMC中的地下水补给有重大影响。
更新日期:2020-03-31
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