相关实验视频
Updated: Jul 17, 2025
12:44
Watershed Planning within a Quantitative Scenario Analysis Framework
Published on: July 24, 2016
8.1K
数据同化策略的好处和注意事项:建模地下水充电的一个例子
Allen M Shapiro1, Frederick D Day-Lewis2,3
1Hydrogeologist, Great Falls, VA, USA.
Ground water
|August 28, 2023
概括
整合最近的数据可以增强地下水充电模型. 过和固定滞后平滑 (FLS) 比预测更好地减少不确定性,尽管预测保持了质量保存.
科学领域:
- 水文学的水文学
- 水文地质学 水文地质学
- 环境科学 环境科学
背景情况:
- 地下水模型对于评估水资源至关重要.
- 实时地下水评估从纳入最近的观测数据中受益.
- 在断裂岩层含水层中估计时间变化的充电存在挑战.
研究的目的:
- 为了比较不同数据同化策略在改善地下水充电模型方面的有效性.
- 评估预测,过和固定滞后平滑 (FLS) 方法,以估计含水层状态和充电.
- 评估模型准确性,不确定性降低和质量保存之间的权衡.
主要方法:
- 将卡尔曼波器应用于数据驱动的机械充电模型.
- 实施并比较了三个数据同化方法:预测,过和固定延迟平滑 (FLS).
- 分析了随时间变化的水平面高度 (h) 和充电估计,包括它们的误差共变率.
主要成果:
- 预测产生了很高的错误共变率,表明存在很大的不确定性.
- 过和FLS通过同化最近的观察结果,产生了与地下水平面动态更好的补充估计,与预测相比,减少了不确定性.
- 虽然过和FLS降低了不确定性,但与预测不同,它们不能保证质量保存.
结论:
- 数据同化策略,特别是过和FLS,通过减少不确定性,显著改善实时地下水状况估计.
- 在数据同化方法之间进行选择需要平衡改进状态估计与质量保存的潜在损失.
- 这些发现适用于对系统输入和外部数据敏感的各种地下水过程模型.
更多相关视频
11:19Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses
Published on: October 21, 2016
12.0K
13:27Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface
Published on: June 8, 2015
8.8K
相关概念视频
01:30Typical Model Studies
380
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
380
01:17Design Example: Analyzing Capacity Contours for Flood Risk Assessment
67
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...
67
01:57Adaptations that Reduce Water Loss
25.7K
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
25.7K
01:12Modeling and Similitude
288
Scaled modeling is a fundamental technique in engineering, enabling the study of large and complex systems by creating smaller, manageable replicas that recreate critical characteristics of the original. In hydrology and civil infrastructure, for example, scaled models of dams help analyze water flow, turbulence, and pressure. This method allows for accurate predictions of real-world behavior within a controlled environment, significantly reducing the cost and time involved in full-scale...
288
01:05Gravimetry: Overview
6.0K
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...
6.0K