Modeling Hydrological Impacts of Groundwater Level in the Context of Climate and Land Cover Change

  • Author(s): Ray-Shyan Wu and Shih Dong-Sin
  • DOI: 10.3319/TAO.2017.10.26.01
  • Keywords: Climate change, Land cover change, WASH123D
  • Groundwater level will be scarce in the dry season and abundant in wet season
  • Its drawdown for mountainous region are more significant than in the flat areas
  • Climate change is more relevant compared to local land cover changes
Abstract

The study uses weather models to generate future rainfall and local temperature, and incorporates a land coverage model to simulate future land use changes. These future scenarios are then incorporated into a rainfall runoff model for basin discharge, which is used to simulate the subsequent influences on river and groundwater levels. The Fengshan Creek basin in northern Taiwan is selected as test site. The RCP2.6 scenario is adopted to simulate future climate. The hydrological impacts, in the context of groundwater, for the near future (2020-2039), future (2050-2069), and distant future (2080-2099) are discussed. Simulations indicate that the influence of climate change is more important compared to local land cover changes at our study site. Both river stage and groundwater levels are influenced under future scenarios, but seasonally rather than annually; the dry and wet seasons are amplified. The results indicate that in the future water resources will be scarce in the dry season and more abundant in the wet season. In addition, trends in groundwater drawdown for mountainous region are more significant than in the downstream flat areas.

Read 100 times