对雨暴势头和非静止变化的模式的进化分析,以应对不同地形的气候变化
Chien-Lin Huang1, Nien-Sheng Hsu2
1Department of Civil Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan.
Scientific reports
|February 16, 2024
概括
气候变化改变了暴雨的模式,显示了向较短,较强的降雨或较低强度与较高总降雨量的转变. 台湾 台湾 台湾 台湾
科学领域:
- 气候学和水文学
- 时间序列分析时间序列分析
- 环境数据中的非静态性
背景情况:
- 气候变化正在越来越多地影响极端天气事件,需要了解暴雨演变.
- 传统的分析方法可能无法完全捕捉历史暴雨数据的复杂性和非静止性.
- 识别暴雨特征的变化对于有效的水资源管理和防灾准备至关重要.
研究的目的:
- 分析一个多世纪的暴雨数据,以确定时间演变和非静止的维度过渡.
- 研究气候变化对暴雨主要特征的影响:最大强度 (MAXI),持续时间 (D),总降雨量 (TR) 和平均降雨强度 (ARI).
- 为了确定观测到的降雨非静止性背后的地质物理原因.
主要方法:
- 利用部分持续时间系列 (PDS) 来识别暴雨事件并提取特征变化.
- 用于趋势过和非静止识别的集体实证模式分解.
- 应用多维线性抛物线回归来模型平均方差趋势和分布适配的Akaike信息标准.
主要成果:
- 确定了不同的暴雨模式,例如"持续时间短但降雨强度高"和"最大强度较低但总降雨量高".
- 观测到平均降雨强度,持续时间和山脉终点降雨总量的抛物线趋势.
- 检测到季风影响平原最大强度的平均值和变异的增加趋势,表明极端事件的频率和强度越来越高.
结论:
- 在气候变化下,暴雨的特征正在演变,在台湾各地观察到显著的空间变化.
- 季风动态在最大暴雨强度的非静止过渡中发挥着关键作用.
- 特定的地理特征,如山脉,平原和裂谷,在暴雨持续时间和强度方面表现出不同的反应.
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