Analysis of Runoff and Sediment Variation and Its Driving Factors in Lianshui Watershed at Different Time Scales

SHENG Fei; LIU Shiyu; YU Minqi; DAI Yudian

doi:10.13870/j.cnki.stbcxb.2023.03.026

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Analysis of Runoff and Sediment Variation and Its Driving Factors in Lianshui Watershed at Different Time Scales

更新时间：2025-03-12

- Analysis of Runoff and Sediment Variation and Its Driving Factors in Lianshui Watershed at Different Time Scales
- Vol. 37, Issue 3, Pages: 201-207(2023)
- 作者机构：
  
  1. 江西农业大学国土资源与环境学院,南昌,330045
  2. 江西省鄱阳湖流域农业资源与生态重点实验室,南昌,330045
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2023.03.026
  CLC： S157.1
- Published：2023
- 稿件说明：
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SHENG Fei, LIU Shiyu, YU Minqi, et al. Analysis of Runoff and Sediment Variation and Its Driving Factors in Lianshui Watershed at Different Time Scales[J]. 2023, 37(3): 201-207.
DOI：

SHENG Fei, LIU Shiyu, YU Minqi, et al. Analysis of Runoff and Sediment Variation and Its Driving Factors in Lianshui Watershed at Different Time Scales[J]. 2023, 37(3): 201-207. DOI： 10.13870/j.cnki.stbcxb.2023.03.026.

摘要

为深入分析流域水沙变化特征及其驱动因素

揭示水沙变化机理机制。以赣南濂水流域为研究区

基于1965—2020年的水文气象数据和土地利用数据

在年尺度和场次暴雨尺度

利用Mann-Kendall检验法、累积距平法、水沙关系曲线、经验统计分析法等

分析水沙变化特征

建立不同时期水沙关系

并定量评估降雨变化和人类活动对水沙变化的贡献率。结果显示:(1)在年尺度

流域径流深、输沙量分别呈非显著下降和极显著上升趋势

突变年份分别为1998年和1995年。(2)与基准期相比

变化期不同时间尺度的径流深和输沙量波动更大

且水沙相关性均增强

表征外界人为干扰的参数(a)和河流本身输沙能力的参数(b)均增大。(3)在年尺度和场次暴雨尺度

降雨变化和人类活动对径流减少的贡献率分别为-1.1%

101.1%和30.2%

69.8%

对输沙增加的贡献率分别为0.5%

99.5%和-2.0%

102.0%。研究成果可为流域的水沙合理调控及生态可持续发展奠定基础。

Abstract

In order to deeply analyze the characteristics and driving factors of runoff and sediment variation in watershed

and reveal the mechanism of runoff and sediment variation

the Lianshui watershed located in southern Jiangxi province was selected as the research area. Based on the hydro-meteorological and land use data from 1965 to 2020

at the annual scale and single rainstorm scale

we used the Mann-Kendall test method

cumulative anomaly method

runoff-sediment relationship curve and empirical statistical analysis method to analyze the characteristics of runoff and sediment variation

then established runoff-sediment relationship in different periods

and quantitatively evaluated the contribution rate of precipitation variation and human activities to the change of runoff and sediment. The results showed that at the annual scale

the runoff depth and sediment discharge showed a non-significant downward and extremely significant upward trend

respectively

and the abrupt change years were 1998 and 1995

respectively. Compared with the baseline period

the runoff depth and sediment discharge in different time scales of the changing period fluctuated more greatly

and the correlation between runoff and sediment was increased. The parameter a representing external human interference and the parameter b representing the sediment transport capacity of the river were increased. At the annual scale and single rainstorm scale

the contribution rate of precipitation variation and human activities to the decrease of runoff were -1.1%

101.1% and 30.2%

69.8%

respectively

while to the increase of sediment discharge were 0.5%

99.5% and -2.0%

102.0%

respectively. The research results could provide a basis for reasonable regulation of runoff and sediment

as well as the sustainable ecological development of watershed.

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Keywords

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