Groundwater modeling at Klong Praya Bunlue, Phra Nakhon Si Ayuthaya Province

Abstract

This research presents the application of groundwater flow modeling at Khlong Phraya Bunlue Area, Phra Nakhon Si Ayuthaya province. Modeling of groundwater flow performs on both steady state and transient simulations using Visual Modflow software version 3.1. Aquifers target for modeling are Phra Padaeng, Nakhon Luang and Nonthaburi aquifers. Geological model of research area is developed based on the available wells log data. Properties of aquifers and aquitards are determined from pumping test analysis in the field and referred from previous study. Boundary conditions of the model are fixed based on the hydrogeological and hydrological data. Calibration of model uses data from monitoring wells that located inside the modeling area from 1993 until 2003. The result from final model showed that absolute mean of error can be achieved with value less than 1 meter and 1.5 meters at each aquifer, for steady state and transient simulation respectively. Groundwater balance analysis is also applied to Phra Padaeng, Nakhon Luang and Nonthaburi aquifers. Some scenarios of simulation are conducted based on the final model to understand the effects of groundwater abstraction. The results of groundwater flow modeling are used as a tool for groundwater management and can be used for developing the transport model in the future.