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沟道土地整治对不同植被覆盖流域CN值的影响
李星瑶1, 张根广1, 高建恩1,2,3, 高哲1, 麻卉港1, 封博研1, 马林1
1.西北农林科技大学 水利与建筑工程学院, 陕西 杨凌 712100;2.西北农林科技大学 水土保持研究所, 陕西 杨凌 712100;3.中国科学院 水利部 水土保持研究所, 陕西 杨凌 712100
摘要:
[目的] 探究黄土丘陵沟壑区沟道土地整治后流域径流曲线数的变化规律,寻求合适的产流参数,为该区沟道土地整治工程安全和巩固生态建设成果提供科学支撑。[方法] 基于流域实体比尺模型分析不同植被覆盖条件下沟道土地整治对流域径流曲线数的影响。[结果] 同一植被覆盖度下,流域径流曲线数随着整治比例的增大而减小;与未整治流域相比,整治比例为20%时的流域径流曲线数减小了6.77;就分段整治比例而言,流域径流曲线数的减小速率随着整治比例的增大呈先增大后减小的趋势,整治比例由0.5%增大至5%时减小速率最大;不同植被覆盖度下,流域径流曲线数均随着整治比例的增大而减小,植被覆盖度为50%时沟道土地整治后流域径流曲线数的减小速率最大;植被覆盖度对沟道土地整治区域的径流曲线数影响显著,同一整治比例下,植被覆盖度每增大1%,沟道土地整治区域的径流曲线数减小0.22。[结论] 沟道土地整治可以改变流域下垫面,对径流曲线数影响显著。
关键词:  黄土丘陵沟壑区  沟道土地整治工程  SCS-CN  径流曲线数  实体比尺模型
DOI:10.13961/j.cnki.stbctb.2021.04.008
分类号:P334.92
基金项目:国家重点研发计划项目“黄土丘陵沟壑区边坡工程—沟道整治生态安全调控技术”(2017YFC0504703)
Effects of Gully Land Consolidation Project on CN in Catchments with Different Vegetation Coverage
Li Xingyao1, Zhang Genguang1, Gao Jianen1,2,3, Gao Zhe1, Ma Huigang1, Feng Boyan1, Ma Lin1
1.College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China;2.Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China;3.Institute of Soil and Water Conservation, CAS&MWR, Yangling, Shaanxi 712100, China
Abstract:
[Objective] The variation of runoff curve number after the gully land consolidation project (GLCP) was studied to explore the appropriate flow generation parameters, and to provide scientific support for the safety of GLCP and the consolidation of achievements in ecological construction. [Methods] Based on the physical scale model, the influence of GLCP on the runoff curve number under different vegetation cover conditions was investigated. [Results] Under the same vegetation coverage, the runoff curve number decreased with the increase of the land consolidation proportion. Compared with the unconsolidated basin, the runoff curve number decreased by 6.77 when the consolidation proportion was 20%. The decreasing rate of runoff curve number increased firstly and then decreased with the increase of land consolidation proportion, and the decrease rate reached the maximum when the consolidation proportion increased from 0.5% to 5%. Under different vegetation coverage, the runoff curve number decreased with the increase of consolidation proportion, and the decreasing rate of runoff curve number reached the maximum at the vegetation coverage of 50%. Vegetation coverage had great effects on the runoff curve number of the gully land consolidation area, and the runoff curve number decreased by 0.22 in the gully land consolidation area when the vegetation coverage increased by 1%. [Conclusion] The GLCP could change the hydrological characteristics of basin under layer and has significant effects on the runoff curve number.
Key words:  loess hilly and gully region  gully land consolidation project  SCS-CN  curve number  physical scale model