Ambiguities in implementing regulations for sustainable groundwater resources development in Vietnam with a case study of Tra Vinh province in Mekong Delta

被引:0
|
作者
Phan, Thang Long [1 ]
Zhou, Yangxiao [2 ,3 ]
Stigter, Tibor [2 ]
Tran, Vuong Bui [1 ]
Van, Tuc Dang [1 ]
Van, Tuan Pham [1 ]
Hong, Hai Dao [4 ]
机构
[1] Div Water Resources Planning & Invest South Vietna, Ho Chi Minh City 700000, Vietnam
[2] IHE Delft Inst Water Educ, NL-2601 DA Delft, Netherlands
[3] Hebei Univ Geosci, Shijiazhuang 050000, Peoples R China
[4] VNU HCM, Ho Chi Minh City Univ Technol HCMUT, Ho Chi Minh City, Vietnam
关键词
Groundwater sustainability; Vietnamese regulation; Ambiguities and amendments; Tra Vinh case study; AQUIFER;
D O I
10.1016/j.ejrh.2023.101572
中图分类号
TV21 [水资源调查与水利规划];
学科分类号
081501 ;
摘要
Study region: The study region is the coastal Tra Vinh province located in Mekong Delta, Vietnam Study focus: The study aims to clarify the ambiguities in implementing Vietnam's regulation on restrictions of groundwater abstraction in Mekong Delta. Three ambiguities were identified, namely, how should half of the saturated thickness of the unconfined aquifer be computed; is the water level depth of 30 m for the confined aquifer sufficient to prevent seawater intrusion and land subsidence; and why is the interference of water use rights of neighbouring provinces not considered. Numerical groundwater flow, saltwater transport and land subsidence were constructed for Tra Vinh province to assess water level requirements from Vietnam regulation and important constraints for groundwater sustainability. The model results show that although all scenarios satisfy groundwater level requirements from the Vietnam regulation, only the mitigation scenario combined with reducing abstraction and increasing recharge can lead to sustainable development. New hydrological insights for the region: The current groundwater abstraction in Tra Vinh province has caused groundwater storage depletion and induced seawater intrusion, land subsidence, and captured groundwater inflow from neighbouring provinces. When the business as usual continues, seawater may intrude 4-5 km inland and cumulative land subsidence may reach 1.5 m by 2100. Reduction of current abstraction by 50% supplemented with the increase of recharge by 1.5 times in the dunes can lead to sustainable development.
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页数:24
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