Using simulated annealing in landscape metrics to simulate landscape patterns in watershed planning and management
Date Issued
2007
Date
2007
Author(s)
Chen, Min-Hau
DOI
zh-TW
Abstract
Exactly how changes in land use and land cover and climate, human and natural environment, soil, water, or ecological systems are related which is a major research area in sustainable development. Land use changes can influence hydrological processes including infiltration, groundwater recharge, base flow and runoff in a watershed.
Landscape metrics quantified in terms of the spatial relationship of patches the landscape are spatially explicit at the landscape level because the relative location of individual patches within the landscape is represented in some way. Furthermore, Landscape metrics can be useful when planning for natural resources or planning for sustainable land-use. The relationships between spatial patterns and processes, landscape metrics can inform planner about landscape functions, which are difficult to measure directly.
One of the major land use changes that have an impact on the hydrological cycle and regulation are changes in the spatial patterns caused by deforestation and forest fragmentation by human development within a watershed. Optimizing landscape or land use aims to obtain landscape or land use patterns which well sustain landscape functions and processes. This study developed an optimal landscape simulation model by optimizing (maximizing or minimizing) landscape metrics of the forest class level using simulated annealing for alternative land use management strategies in Wu-Tu watershed in Northern Taiwan, and analysis the impact on the hydrological cycle. Landscape models simulate alternative landscape dynamics which provide information to evaluate and test hypotheses or scenarios of landscape or land use management. Optimal objectives were to identify the landscape patterns with the largest mean forest patches by maximizing a landscape metric Mean Patch Size (MPS) deforested scenarios that are removed 5%, 10%, 15%, 20%, 30%, 35%, 40%, 45% and 50% forest to be replaced by built-up area, agricultural land and grassland within the study watershed. The optimal simulation approach can be integrated hydrological with models which can evaluate the impact on the hydrological cycle.
Subjects
景觀指數
景觀生態
土地利用
優化模式
模擬退火法
landscape metrics
landscape ecology
land use
Optimization models
simulated annealing
Type
thesis
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