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Simulation of Regional Flow and Salinity Intrusion in an Integrated Stream‐Aquifer System in Coastal Region: Southwest Region of Bangladesh
Author(s) -
Nobi N.,
Gupta A. Das
Publication year - 1997
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/j.1745-6584.1997.tb00147.x
Subject(s) - aquifer , saltwater intrusion , streams , estuary , hydrology (agriculture) , geology , salinity , groundwater , environmental science , oceanography , geotechnical engineering , computer network , computer science
A numerical model for simulation of the regional flow and salt‐water intrustion in an integrated stream‐aquifer system in coastal regions is developed, considering the dynamic interaction between the streams and the aquifer. The stream‐aquifer model comprised of a two‐dimensional depth‐average finite‐element model of the aquifer system and a quasi‐steady node and reach model of the river network. The applicability of the model was demonstrated, through simulation of the spatial and temporal distributions of flow and salinity in the estuaries and in the underlying aquifer of the Southwest Region of Bangladesh. The important management aspects of water transfer and additional pumping and their effects on the system were evaluated. The interactions between the streams and the aquifer significantly influenced the flow and salt‐water intrusion in the aquifer and the river network. An increased abstraction of ground water in the area caused a significant increase in the estuarine salinity. The salinity intrusion in the estuaries of the area, except in the southwest corner, could be reduced significantly by diverting the available water from the Ganges through the boundary river Gorai.