Integrating land use model and hydrological model for landscape ecology planning and management in watersheds
Date Issued
2008
Date
2008
Author(s)
Wu, Pei-Jung
Abstract
Watersheds conserve soil, water, and habitats; as a result, watersheds play an important role in ecology and environment. Land uses of watersheds are the base of ecology and environmental systems that can influence the variation and sustainability of watersheds. Developing an approach for simulating and assessing land use changes and their effects on land use patterns and hydrological processes at the watershed level is essential for land use and water resource planning and management. This study provides a novel approach that combines a land use change model, landscape metrics and a watershed hydrological model with an analysis of impacts of future land use scenarios on land use pattern and hydrology. The proposed models are applied to assess the impacts of different land use scenarios that include various spatial and non-spatial policies in the Wu-Tu watershed. The objective of this study is to analyze the planning strategies and observe the scaling effects on both simulated land-use patterns and hydrological components for the study watershed. The results revealed that spatial constriction policies have more significant impacts than agriculture conversion policies on land use spatial pattern and simulated hydrological components. Considering both spatial patterns and simulated hydrological results: from the spatial perspective, this study recommends taking free-agriculture conversion policy and forest and slope area constriction policy as the planning strategy of the Wu-Tu watershed. From the hydrological perspective, however, this study recommends taking free-agriculture conversion policy and forest constriction policy. According to the results of spatial scale effect, the grain size of this study area should be smaller than 100 m × 100 m.
Subjects
Land-use change
landscape metrics
hydrological model
spatial scale
SDGs
Type
thesis
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