| 不同时间尺度濂水流域水沙变化及其驱动因素分析 |
| |
| 引用本文： | 盛菲,刘士余,余敏琪,戴余典.不同时间尺度濂水流域水沙变化及其驱动因素分析[J].水土保持学报,2023,37(3):201-207,217. |
| |
| 作者姓名： | 盛菲 刘士余 余敏琪 戴余典 |
| |
| 作者单位： | 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 |
| |
| 基金项目： | 国家自然科学基金项目(31960331) |
| |
| 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。
|
| 关 键 词： | 年尺度 场次暴雨尺度 水沙变化 水沙关系 驱动因素 |
| 收稿时间： | 2022/10/12 0:00:00 |
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.Analysis of Runoff and Sediment Variation and Its Driving Factors in Lianshui Watershed at Different Time Scales[J].Journal of Soil and Water Conservation,2023,37(3):201-207,217. |
| |
| Authors: | SHENG Fei LIU Shiyu YU Minqi DAI Yudian |
| |
| Institution: | 1. College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045;2. Key Laboratory of Poyang Lake Watershed Agricultural Resources and Ecology of Jiangxi Province, Nanchang 330045 |
| |
| 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. |
| |
| Keywords: | annual scale single rainstorm scale runoff and sediment variation runoff-sediment relationship driving factors |
|
| 点击此处可从《水土保持学报》浏览原始摘要信息 |
| 点击此处可从《水土保持学报》下载免费的PDF全文 |
|
