桃園中壢台地海岸帶地下水流動特徵研究(2/2)

Understanding groundwater recharge and discharge mechanisms are essential toinvestigating characteristics of regional groundwater flow, and important tosustainable groundwater management. Due to numerous industrial parks,increasing populations, massive land-use changes, the land and waterenvironments of the Taoyuan-Zhongli Tableland (TZT) are facing critical impactsnever occurred before. It is necessary to investigate groundwater recharge anddischarge patterns of the tableland. Our first phase study proposed 2 years oftasks aiming to understand the groundwater discharge characteristics over thecoastal zone of the TZT. Previous studies of Time-lapsed Electric ResistivityTomography (ERT) results in 2020 showed a possibility of significantgroundwater discharge over the TZT coastal zone. Cross-shore time-lapsed ERT,groundwater levels and salinity measurements, and density-dependentgroundwater flow simulations are proposed for 2 years. The first year will setup across-shore 200 m time-lapsed ERT, 2 monitoring wells of 50 m, and cross-shorehydrogeological profiles, and 2-D density-dependent groundwater flowsimulations. Expected results of the first year is to clarify groundwater dischargecharacteristics of the TZT coastal area. The second year will setup another twocross-shore time-lapsed ERT measurements each with 200 m long, monitorgroundwater level and salinity, build up hydrogeological models of TZT, and 3-Ddensity-dependent groundwater flow simulations. Expected outcomes of thesecond year is to provide estimations of groundwater discharge, which will besued as the flux boundary conditions at the west side of the TZT. The proposedsecond phase study will focus on groundwater recharge of the TZT. With resultsof the first two phases, the third phase is to provide scientific-supportedgroundwater recharge and discharge estimations to support sustainablegroundwater resources managements and impact assessments of land use change to the TZT.