基础流量对印度半岛的河流洪水有很大影响
Shailza Sharma1, P P Mujumdar2,3
1Department of Civil Engineering, Indian Institute of Science, Bangalore, India. shailzas@iisc.ac.in.
Scientific reports
|January 13, 2024
概括
印度半岛的洪水规模正在下降,基流比降雨或土壤水分发挥更重要的作用. 人类干预,如水库调节,也会影响洪水特征,减少峰值,但增加持续时间.
科学领域:
- 水文学的水文学
- 环境科学 环境科学
- 气候科学 气候科学
背景情况:
- 极端降雨是洪水的先兆,但并不总是表明严重程度.
- 之前的流域湿度,特别是土壤水分和更深的和区,显著影响洪水的幅度.
- 了解这些因素对于有效的洪水管理至关重要.
研究的目的:
- 评估洪水大小与极端降雨,土壤湿度和70个印度半岛水域 (1979-2018) 的基流之间的关联.
- 评估人类干预,特别是流量规则对洪水特征的影响.
- 为了确定土壤水分和基流对河流洪水量的影响.
主要方法:
- 分析了1979-2018年年度洪水大小,极端降雨量,土壤湿度和基流数据.
- 对水文变量的趋势分析和流量调节效应的评估.
- 事件巧合分析,以确认水文成分对洪水的触发作用.
主要成果:
- 在大多数研究的水域中,每年的洪水量呈现下降趋势.
- 水库调节减少了洪水峰值和水量,但增加了洪水事件的持续时间.
- 基本流动趋势反映了洪水趋势,比土壤水分或降雨极端对洪水规模的影响更大.
结论:
- 基流是印度半岛河流洪水规模的更关键驱动因素,而不是先前的土壤水分或极端降雨.
- 人类干预显著改变了洪水的特征,需要适应性管理策略.
- 洪水规模的下降表明该地区发生了复杂的水文变化.
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