Modeling and assessing land-use and hydrological processes to future land-use and climate change scenarios in watershed land-use planning |
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| Authors: | Yu-Pin Lin Nien-Ming Hong Pei-Jung Wu Chien-Ju Lin |
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| Institution: | (1) Department of Bioenvironmental Systems Engineering, National Taiwan University, 1 Section 4 Roosevelt Road, Taipei, 10617, Taiwan;(2) Department of Environmental Resources Management, The Overseas Chinese Institute of Technology, Taichung, Taiwan |
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| Abstract: | Effective information regarding environmental responses to future land-use and climate change scenarios provides useful support
for decision making in land use planning, management and policies. This study developed an approach for modeling and examining
the impacts of future land-use and climate change scenarios on streamflow, surface runoff and groundwater discharge using
an empirical land-use change model, a watershed hydrological model based on various land use policies and climate change scenarios
in an urbanizing watershed in Taiwan. The results of the study indicated that various demand and conversion policies had different
levels of impact on hydrological components in all land-use scenarios in the study watershed. Climate changes were projected
to have a greater impact in increasing surface runoff and reducing groundwater discharge than are land use changes. Additionally,
the spatial distributions of land-use changes also influenced hydrological processes in both downstream and upstream areas,
particularly in the downstream watershed. The impacts on hydrological components when considering both land use and climate
changes exceeded those when only considering land use changes or climate changes, particularly on surface runoff and groundwater
discharge. However, the proposed approach provided a useful source of information for assessing the responses of land use
and hydrological processes to future land use and climate changes. |
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| Keywords: | Impact assessment Land-use modeling Hydrological modeling Climate change Hydrological components Land-use planning policy Taiwan |
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