Division, Naming, and Spatial Distribution Characteristics of Small Watersheds in Mixed Terrains:A Case Study of Yingwen River Basin

CHEN Fei-yong, CHEN Qian-xun, JIANG Qian-qian, MA Shu-juan, XU Jing-tao, REN Guang-xin, CHENG Xiao-xiang, WANG Jin

Journal of Changjiang River Scientific Research Institute ›› 2025, Vol. 42 ›› Issue (5) : 1-9.

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Journal of Changjiang River Scientific Research Institute ›› 2025, Vol. 42 ›› Issue (5) : 1-9. DOI: 10.11988/ckyyb.20240290
Comprehensive Management of River Basin

Division, Naming, and Spatial Distribution Characteristics of Small Watersheds in Mixed Terrains:A Case Study of Yingwen River Basin

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[Objective] Focusing on the Yingwen River Basin in Shandong Province, this study aims to explore the extraction, division, naming methods for small watersheds in mixed terrains, and to analyze spatial distribution characteristics of small watershed areas and river network densities. [Methods] This study utilized high-precision SRTM-DEM data, combined with hydrological analysis modules, to extract micro-watersheds, river networks, and watershed boundaries. The optimal catchment threshold was determined using the river network density method. Micro-watersheds were merged into small watershed units based on natural catchment relationships, and named according to Specification SL 653—2013. In complex terrain areas, local corrections were made by referencing high-resolution remote sensing images and field survey results to ensure the accuracy of the division. Meanwhile, the main stream, first-order tributaries, and second-order tributaries of the Yingwen River Basin were extracted, and the characteristics such as the area of small watersheds and the density of river networks were statistically analyzed. [Results](1) This study successfully extracted 1 main stream (the main stream of Yingwen River), 22 first-order tributaries, 48 second-order tributaries, and 1 large reservoir, establishing a complete water system network. (2) A total of 28 small watersheds were merged. Small watershed areas in upstream mountains were generally smaller, while those in downstream hilly plains were relatively larger. This was mainly caused by terrain limitations combined with human activities. (3) All 28 small watersheds were named based on the proposed naming process, providing strong support for watershed management and water resource protection. (4) The river network density in Yingwen River Basin exceeded 0.2 km/km2, indicating abundant water system resources. Areas with river network densities of 0.4-0.6 km/km2 accounted for 60.71% of the total area, mainly concentrated in the middle and lower reaches. Areas with densities of 0.6-0.8 km/km2 accounted for 28.57%, distributed in the upper, middle, and lower reaches. [Conclusion] (1) The analytical framework for division, naming, and spatial distribution characteristics of small watersheds in mixed terrains proposed in this paper provides scientific methods and practical cases for similar studies. (2) Complete-type small watersheds are dominant, indicating relatively intact water systems with limited human disturbance. The spatial distribution characteristics of small watershed areas and river network densities reveal the combined influence of terrains and human activities on water system development. (3) The number of first-order tributaries in the Yingwen River Basin exhibits a significant increasing trend from upstream to downstream, reflecting the complexity of river network systems in middle and lower reaches and the promoting effect of human activities on water system development. The distribution characteristics of the length of tributaries per unit area and the density of river networks further reveal the abundance and spatial differences of water system resources within the basin.

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small watershed / mixed terrain / spatial distribution characteristics / Yingwen River

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CHEN Fei-yong , CHEN Qian-xun , JIANG Qian-qian , et al . Division, Naming, and Spatial Distribution Characteristics of Small Watersheds in Mixed Terrains:A Case Study of Yingwen River Basin[J]. Journal of Changjiang River Scientific Research Institute. 2025, 42(5): 1-9 https://doi.org/10.11988/ckyyb.20240290

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Abstract
在喀斯特地区,较大的地表坡降和坡地开发强度导致承载在地表景观上的污染物因地势和降水加倍迁移到河水中。以赤水河流域中上游为研究区,分别在全子流域、子流域坡地、子流域陡坡地三个层面上提取景观结构、景观开发强度和景观格局指数,研究各级坡地景观特征对水质的影响。结果表明：① 与总林地相比坡林地对水质潜在的“汇”作用更加显著;占总耕地面积不足1/7的陡坡耕地、却对河水中总磷（TP）和氨氮（NH<sub>3</sub>-N）浓度大小贡献显著（相关系数为0.608和0.614）。② 景观开发强度与各水质污染物指标呈现显著而稳定的正相关性,相关系数最高达0.960,它比单个景观对水质指标更具解释能力。③ 斑块形状复杂度、景观多样性、景观分离度均与水质污染物指标呈高度或显著正相关,且随着地形坡度的增大,水质污染物指标对景观散布与并列指数（IJI）和农香多样性指数（SHDI）越来越敏感。故减少对坡地尤其是陡坡地景观的不当人为干扰,对喀斯特地区流域水质保护有重要意义。
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