长江流域子流域边界数据集

本数据集为长江流域子流域矢量边界数据，基于水文分析与汇水单元划分原则，将长江全流域精细划分为多级子流域空间单元，精准界定各子流域的汇水范围、边界轮廓与空间拓扑关系，完整覆盖长江干流及主要支流对应的各级子流域区域。该数据可作为流域水文模拟、水资源分区管理、生态环境分区评价、水土流失防控与水利工程布局的核心基础空间资料，广泛应用于子流域尺度的水文过程解析、水生态安全格局构建、污染溯源与管控、流域综合规划及长江大保护相关精细化管理工作，为实现长江流域分区分类精准治理与可持续发展提供权威、规范的空间边界支撑。

This dataset is vector boundary data of sub-basins within the Yangtze River Basin. Derived from the principles of hydrological analysis and catchment unit delineation, the entire Yangtze River Basin is finely partitioned into multi-level sub-basin spatial units. This partitioning accurately defines the catchment scope, boundary contour and spatial topological relationship of each sub-basin, and fully covers the sub-basin areas at all levels corresponding to the main stream and major tributaries of the Yangtze River. This dataset can serve as core foundational spatial data for basin hydrological simulation, water resource zoning management, eco-environmental zoning assessment, soil and water loss prevention and control, and water conservancy project layout. It is widely applied to hydrological process analysis at the sub-basin scale, construction of aquatic ecological security patterns, pollution traceability and control, basin comprehensive planning, and refined management related to the Great Protection of the Yangtze River. It provides authoritative and standardized spatial boundary support for achieving targeted zoned and classified governance and sustainable development of the Yangtze River Basin.