Treffer: Construction and control strategies for flood security pattern from the "source-flow-sink" landscape perspective: A case study of Changsha, China.

Existing studies primarily construct flood security patterns based on the static "patch-corridor-matrix" research paradigm. This study integrates this paradigm with source-sink theory, proposing a new approach from the "source-flow-sink" landscape perspective. This method combines dynamic stormwater runoff processes with static landscape patterns to create a novel flood security pattern. Using Changsha City as a case study, the research applied the Curve Number Model, iso-volume algorithm, and spatial statistics tools to identify key source-sink landscape patches. Based on the distribution of these patches and existing river system, hydrological analysis tools were used to extract significant flow landscape corridors. Key sub-watersheds were subsequently identified, completing the flood security pattern construction. Finally, the influence of source-sink landscape patterns on flood risk was analyzed using the Spearman coefficient, and control strategies were proposed. The results indicated 29 important source patches with an area of 20.72 km2, 49 important sink patches with an area of 110.43 km2, and 18 significant flow corridors within the study area. The key sub-watersheds included the Longwanggang, Guitang, Baqu, and downstream reaches of the Liuyang River. Control strategies focused on optimizing surface runoff and improving spatial layout in key source-flow-sink landscapes. Identifying critical source-flow-sink landscapes, based on the flood risk formation mechanism and management requirements, is essential for optimizing watershed landscape patterns and ensuring urban flood security. [ABSTRACT FROM AUTHOR]

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