ThaiScience
ThaiScience
ENGINEERING JOURNAL CHIANG MAI UNIVERSITY
Volume 26, No. 02, Month AUGUST, Year 2019, Pages 66 - 79
Simulation of groundwater flow and saltwater intrusion around a storage pond in phang-nga province
Patsawan Boonyarattapant, Surachai Lipiwattanakarn, Chaiwat Kayankarnnavy and Punpim Puttaraksa Mapiam
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This study aims to simulate the existing and future conditions of groundwater flow and saltwater intrusion around a storage pond in Na Toei mining area, Amphoe Thai Mueang, Phang-nga province. The pond was designated to be a water supply storage reservoir with a production capacity for 4 phases, i.e., 24,000, 48,000, 72,000 and 96,000 m3/d pumping rates. The 3-dimensional groundwater model, Visual MODFLOW 2011.1, was used to simulate groundwater flow and saltwater intrusion. The results show that the existing groundwater levels vary between 0.0 - 7.0 meters with groundwater flowing from North and South direction into the Bang Thong stream located along the pond and eventually draining into the Andaman Sea. The existing saltwater intrusion is at minimum. For the future condition, with 24,000 and 48,000 m3/d pumping rates, groundwater levels around the pond are approximately 1.0 -3.0 meters higher than the existing condition due to the water level in the pond was kept at 2.00 meters higher than the existing groundwater level. On the other hand, with 72,000 and 96,000 m3/d pumping rates, groundwater levels around the pond are extremely lower than the existing condition leading to the expansion of the intruded area around the pond. For all simulation cases, the saltwater intrudes approximately 500 - 1,000 meters along the shoreline, and it also upwardly intrudes and disperses through Klong Bang-Tong into the pond. The salinity concentration around the pond varies between 100 - 500 mg/L.
Keywords
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Published by : Faculty of Engineering Chiang Mai University
Contributions welcome at : http://researchs.eng.cmu.ac.th/?name=journal
