Impacts of economic development on groundwater resource in Vu Gia – Thu Bon coastal area

Dinh Quang Duong1
1 Ü+Ö im Bauwesen, Prof. Stolpe, Ruhr Universität Bochum

O 10.5 in Water and environment in South East Asia

24.03.2018, 10:00-10:15, 2

Vu Gia – Thu Bon is one of the nine biggest river basins in Vietnam and its lowland is the hometown of more than one million inhabitants with a rapid economic development. With more than 2.000 mm rainfall per year and a widespread river system, it seems that surface water is enough to supply the area. However, due to a pronounced dry season and an insufficient domestic water supply system makes groundwater still a major source of drinking water for more than seventy percent of the households and it is also exploited by many resorts, hotels and small to medium industrial factories. Conversely, rivers are impacted by seawater meaning that pumping stations operate not all the time and only at a proper capacity. This situation means that the groundwater needs to be well protected and managed for a long term use. Meanwhile, the groundwater source is being degraded due to intensive exploitation and groundwater recharge seems to reduce notably as a result of concreting the land.

This paper aims to evaluate potential impacts of economic development on groundwater resource for the coastal area from Da Nang to Hoi An city – the lowland of Vu Gia – Thu Bon basin. The impacts will be considered in two sides: (i) reducing the groundwater recharge and (ii) increasing groundwater pumps and pumping rates. A numerical model will be set up based on hydrogeological, land use, groundwater use data using MODFLOW computer code -  a well-known, standard computer code for groundwater modelling over the world. Main results will be groundwater table maps for the current situation and development scenarios.

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