一个全面的分析和SPI和SPEI对空间时间干旱评估的比较
Ahmad Abu Arra1,2, Eyüp Şişman3,4
1Department of Civil Engineering, Yildiz Technical University, Istanbul, Türkiye. ahmad.arra@std.yildiz.edu.tr.
Environmental monitoring and assessment
|September 26, 2024
概括
这项研究比较了标准化降雨指数 (SPI) 和标准化降雨蒸发指数 (SPEI) 用于干旱评估. 虽然SPI和SPEI显示出高度的相关性,但它们的干旱特征和分类不同,凸显了需要仔细选择指数的必要性.
科学领域:
- 水文学的水文学
- 气候学 气候学 气候学
- 环境科学 环境科学
背景情况:
- 干旱指数对于水资源管理和减缓战略至关重要.
- 标准化降水指数 (SPI) 和标准化降水蒸发指数 (SPEI) 是广泛使用的,但需要进行全面的比较.
- 干旱特征和分类依赖于指数,需要仔细选择.
研究的目的:
- 使用创新干旱分类矩阵 (IDCM) 对空间时间干旱评估的SPI和SPEI进行比较.
- 分析干旱指数,特征和分类在事件和月度尺度上的差异.
- 调查现场和数据库衍生SPEI值之间的差异.
主要方法:
- SPI和SPEI在伊斯坦布尔 (1951-2020年) 干旱评估中的应用.
- 使用创新干旱分类矩阵 (IDCM) 进行比较分析.
- 从气象站获得的SPEI与来自专门数据库的SPEI进行比较.
主要成果:
- SPI和SPEI表现出类似的变化和高相关性 (>0.65).
- 在事件尺度上,对于干旱特征,SPI和SPEI之间没有发现一致的关系.
- 大约60%的月份在SPI和SPEI之间显示一致的干旱分类.
- 在现场和来自卫星的SPEI之间观察到显著的差异.
结论:
- 对SPI和SPEI进行全面比较对于准确的干旱研究和有效的水资源管理至关重要.
- 选择干旱指数显著影响干旱评估结果.
- 在干旱分析中,SPEI数据源的差异需要仔细考虑.
更多相关视频
相关概念视频
01:17Precipitation and Co-precipitation
1.7K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
1.7K
01:12Precipitation Processes
431
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
431
02:41Responses to Drought and Flooding
10.6K
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.
10.6K
01:03Precipitation Gravimetry
5.5K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
5.5K
01:21Precipitation Titration Curve: Analysis
1.1K
The precipitation titration curve demonstrates the change in concentration of one reactant with the volume of titrant added. During the titration of chloride ions with silver nitrate, the precipitation titration curve is divided into three regions: before, at, and after the equivalence point. Before the equivalence point, low redissolution of the sparingly soluble silver chloride precipitate gives a low silver ion concentration. However, in the second region, representing the equivalence point,...
1.1K
01:17Design Example: Analyzing Capacity Contours for Flood Risk Assessment
41
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...
41