艾默格QPE产品可以捕捉到城市洪水规模的暴雨吗?
Jinyu Xu1, Youcun Qi1, Donghuan Li1
1Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing, China.
The Science of the total environment
|May 8, 2024
概括
最新的全球降水量测量综合多卫星检索 (IMERG) 卫星数据难以准确估计城市地区的暴雨. 这种卫星产品经常高估小雨,低估大雨,影响洪水预测模型.
科学领域:
- 水文和远程传感技术
- 城市气候学和灾害管理
背景情况:
- 城市地区面临越来越多的洪水风险,因为强烈的降雨和高透性,需要精确的降水数据用于水文模拟.
- 在城市环境中获得小规模的精确降雨数据是一个重大挑战,阻碍了有效的洪水管理策略.
研究的目的:
- 评估全球降雨量测量综合多卫星检索 (IMERG) 最新版本06B (V06B) 卫星降雨产品的性能.
- 评估IMERG在捕获与北中国平原城市洪水规模相关的强降雨事件的准确性.
主要方法:
- 使用雷达标尺合并降水估计作为验证的参考数据集.
- 分析了V06B IMERG在北中国平原研究区域估计降水量的表现.
- 量化IMERG能够检测和准确地表示小城市规模的大量降水事件的能力.
主要成果:
- IMERG V06B 显示了不准确的数据,高估了整个研究区域的轻微降水量和低估了大雨量.
- 该产品表现出捕捉小规模大降雨的能力不佳,接近零的命中率和超过40%的失误率.
- 虽然扩大大雨量覆盖面稍微减轻了失误,但空间准确性和强度估计仍然很差,周围轻雨量被高估.
结论:
- V06B IMERG产品在准确捕捉城市洪水风险评估至关重要的小规模大降水中心方面存在局限性.
- 结果为IMERG开发人员和用户提供了有关产品在城市水文应用中的性能的见解.
- 需要改进的卫星降水估计技术,以可靠地预测城市洪水和减轻灾害.
相关概念视频
Design Example: Analyzing Capacity Contours for Flood Risk Assessment
44
Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
44
Conservation of Mass in Moving, Nondeforming Control Volume
1.1K
Stormwater detention basins are essential in managing runoff during heavy rainfall, particularly in urban areas where impervious surfaces increase the risk of flooding. Understanding the conservation of mass in these systems allows engineers to optimize basin performance, balancing inflow, outflow, and water storage.
In the context of a detention basin, the conservation of mass states that the total mass of water entering the basin must equal the mass leaving the basin plus any accumulation of...
In the context of a detention basin, the conservation of mass states that the total mass of water entering the basin must equal the mass leaving the basin plus any accumulation of...
1.1K
Applications of GIS: Disaster Management and Emergency Response
74
Geographic Information System (GIS) technology is essential for risk identification, action prioritization, and resource optimization in critical situations like flooding and earthquakes. By integrating spatial and demographic data, GIS provides a comprehensive framework for emergency response.GIS integrates data layers, like rainfall intensity, topography, elevation profiles, and river levels, to model high-risk flood zones. These layers assess areas susceptible to flooding based on their...
74
Gravimetry: Overview
5.6K
Gravimetric analysis is a quantitative method where the analyte is isolated and weighed directly or after conversion into a substance of known composition. Gravimetric analysis can be classified as precipitation, electrogravimetry, volatilization, and particulate gravimetry, based on the method used to isolate the analyte.
In precipitation gravimetry, the analyte is converted into a precipitate and weighed. For example, the silver content in a sample can be estimated by precipitating and...
In precipitation gravimetry, the analyte is converted into a precipitate and weighed. For example, the silver content in a sample can be estimated by precipitating and...
5.6K
Responses to Drought and Flooding
10.7K
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
10.7K
Design Example: Creating a Hydraulic Model of a Dam Spillway
159
Scaled hydraulic models of dam spillways provide a practical way to replicate and study the intricate flow dynamics of these structures. Often built to a 1:15 ratio, these models allow for observing critical water behavior, such as velocity distribution, flow patterns, and energy dissipation.
159


