相关实验视频
Updated: Jan 17, 2026

06:37
Continuous Hydrologic and Water Quality Monitoring of Vernal Ponds
Published on: November 13, 2017
9.6K
在伏尔塔盆地进行地下水储存和充电评估的多来源方法
Sergio A Barbosa1, Norman L Jones1, Gustavious P Williams1
1Brigham Young University, Department of Civil and Construction Engineering, Provo, UT, USA.
The Science of the total environment
|September 18, 2025
概括
伏尔塔盆地的地下水储量从2002年到2012年几乎没有变化,然后到2022年大幅增加. 这项研究使用多个卫星数据源来分析该地区的地下水变化和充电率.
科学领域:
- 水文学的水文学
- 遥感 遥感 遥感 遥感
- 气候科学 气候科学
背景情况:
- 在数据稀缺的半干旱地区,如伏尔塔盆地,撒哈拉以南非洲,评估地下水储存至关重要.
- 由于有限的地面数据,传统方法面临挑战.
研究的目的:
- 用多源遥感方法分析伏尔塔盆地的地下水储存变化和充电率.
- 为了评估新的全球土地数据同化系统 (GLDAS) v2.2数据集的性能,与已建立的数据对比.
主要方法:
- 来自美国宇航局重力恢复和气候实验 (GRACE),气候危险组红外降雨与站 (CHIRPS),GLDAS v2.1和v2.2以及哥白尼卫星数据的综合数据.
- 应用了表层水位波动方法来估计地下水补充率.
- 将GLDAS v2.2地下水异常与GRACE衍生数据进行比较.
主要成果:
- 从2002年至2012年间,地下水储存量出现了微小的变化,随后从2012年至2022年间大幅增加 (约1. 30 公里3).
- 伏尔塔湖主导着陆地储水 (约50%).
- 估计的充电率与井数据一致;GLDAS v2.2显示的异常幅度比GRACE.
结论:
- 伏尔塔盆地在过去十年中经历了显著的地下水增加,受到极端降水以外的因素的影响,例如土地使用.
- 多源卫星数据为在数据有限的地区监测地下水提供了可行的方法.
- 新的GLDAS数据集提供了有价值的见解,但需要与GRACE数据进行仔细比较.
相关概念视频
Voltammetry: Overview
2.8K
Voltammetry is an electroanalytical technique in which the current flowing through an electrochemical cell is measured as a function of applied potential, typically under conditions of concentration polarization. The technique provides valuable information about redox-active species, and the current response is plotted as a voltammogram.
A voltammetric cell uses three electrodes: a working electrode, a reference electrode, and an auxiliary electrode. The redox reactions occur in the working...
A voltammetric cell uses three electrodes: a working electrode, a reference electrode, and an auxiliary electrode. The redox reactions occur in the working...
2.8K
Design Example: Analyzing Capacity Contours for Flood Risk Assessment
286
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...
286
Voltammetry: Stripping Methods
831
Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
831
Gravimetry: Overview
13.5K
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...
13.5K
Voltaic/Galvanic Cells
63.0K
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
63.0K
Voltammetry: Factors Affecting Measurements
523
A current produced due to the redox reactions of the analyte at the working and auxiliary electrodes is called a faradaic current. The reaction can be divided into two types. The current generated due to the reduction of the analyte is called cathodic current, and it carries a positive charge. In contrast, the current produced by analyte oxidation is known as an anodic current, and it has a negative charge. The applied potential at the working electrode determines the faradaic current flow, and...
523

