3. Suitability Evaluation Methodology
Because factors affect the wetland restoration are numerous and complex, it is not reasonable to
evaluate the restoration suitability by one indicator merely. Therefore we select numerous indicators
relative to wetland restoration for the evaluation [9]. A three-step approach is proposed in the
methodology: criteria information extraction, criteria value assignment and normalization, and integrated
evaluation.
3.1 Criteria information extraction
Considering wetland characteristics, function and the data’s availability, we selected criteria to develop
the evaluation on two spatial scales: The first consists of physical parameters that define wetland
properties, including hydrologic regime, soil characteristics and topography; while the second consists of
parameters that characterize wetland function, including overland flow length, water quality, and stream
order. Physical parameters such as hydric soil can be used as a benchmark to assess the degradation of
wetlands [10]; while land usecover influences the material and energy exchange between wetlands,
thereby affecting the wetland landscape pattern [11]; and the topography determines the spatial
distribution of soil moisture and wetland hydrology in the symbol of saturation index, SI. Landscape
parameters as Strahler stream order and overland flow length are used to estimate site’s ability to
contribute to the downstream water quality [12].
3. Suitability Evaluation Methodology
Because factors affect the wetland restoration are numerous and complex, it is not reasonable to
evaluate the restoration suitability by one indicator merely. Therefore we select numerous indicators
relative to wetland restoration for the evaluation [9]. A three-step approach is proposed in the
methodology: criteria information extraction, criteria value assignment and normalization, and integrated
evaluation.
3.1 Criteria information extraction
Considering wetland characteristics, function and the data’s availability, we selected criteria to develop
the evaluation on two spatial scales: The first consists of physical parameters that define wetland
properties, including hydrologic regime, soil characteristics and topography; while the second consists of
parameters that characterize wetland function, including overland flow length, water quality, and stream
order. Physical parameters such as hydric soil can be used as a benchmark to assess the degradation of
wetlands [10]; while land usecover influences the material and energy exchange between wetlands,
thereby affecting the wetland landscape pattern [11]; and the topography determines the spatial
distribution of soil moisture and wetland hydrology in the symbol of saturation index, SI. Landscape
parameters as Strahler stream order and overland flow length are used to estimate site’s ability to
contribute to the downstream water quality [12].
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