Quantifying Impacts of Climate and Land Use Change on Groundwater Hydrology and Sustainability of the Quaioit River Watershed

DOI

10.2991/assehr.k.220103.018How to use a DOI?

Keywords

Land Use and Climate Change (LUCC); Soil and Water Assessment Tool (SWAT); SWAT-MODFLOW; Streamflow; Watershed Hydrology; Watershed Sustainability; Quiaoit River Watershed (QRW)

Abstract

Water plays a vital role in our daily activities. As the world’s population increases, water demand increases. Water is subject to pressure due to land use and climate changes. Groundwater, tagged as the most reliable alternative resources is in no exemption and must be studied with proper technology for sustainability. SWAT and coupled SWAT-MODLFOW were used to simulate the impact of land use and climate change on the QRW groundwater hydrology and sustainability. The study aimed to: simulate the impacts of land use change using historical change, municipal land use plan, and future demand for land use conversion; simulate the impacts of climate change on groundwater; simulate the combined impacts (LUCC); and provide policy recommendation towards groundwater sustainability. The results of the study show that the SWAT model can adequately simulate the streamflow and efficiently characterize the watershed. The SWAT and SWAT-MODFLOW revealed that urban expansion decreases both the annual recharge of the watershed and the urban areas. A combination of urban, agricultural and grassland expansion, respectively, would increase the groundwater recharge while decreases the urban groundwater recharge. Simulating the 2035 and 2050 climate scenario would both increase groundwater recharge. LUCC1 and LUCC2 (LUCC projections) both increases the groundwater recharge which varies on the individual quantified impacts. Considering the extraction and different demands of water in the watershed, the groundwater recharge and storage can meet the demand for water for the next 15 years. Yet, the study revealed that wet season becomes wetter, while, dry season becomes drier. Under land use and climate changes projections, monthly groundwater supply will abruptly change. It is therefore recommended that a municipal policy should be implemented to protect the groundwater resources against overexploitation. A policy that could mitigate the effect of climate and land use changes on groundwater resources and watershed preservation for sustainability.

Copyright

© 2022 The Authors. Published by Atlantis Press SARL.

Open Access

This is an open access article under the CC BY-NC license.

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TY  - CONF
AU  - Julius Jimenez
AU  - Nathaniel Alibuyog
AU  - Virgilio Julius Manzano
AU  - Bethany Grace Calixto
AU  - Reynold Caoili
AU  - Carlos Pascual
PY  - 2022
DA  - 2022/01/06
TI  - Quantifying Impacts of Climate and Land Use Change on Groundwater Hydrology and Sustainability of the Quaioit River Watershed
BT  - Proceedings of the 2nd International Conference on Education and Technology (ICETECH 2021)
PB  - Atlantis Press
SP  - 111
EP  - 119
SN  - 2352-5398
UR  - https://doi.org/10.2991/assehr.k.220103.018
DO  - 10.2991/assehr.k.220103.018
ID  - Jimenez2022
ER  -