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相关概念视频

Precipitation Gravimetry01:03

Precipitation Gravimetry

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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.
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Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

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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...
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To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
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Methods of Obtaining Topography01:25

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Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. Topographic surveying relies on traditional and modern methods, each with distinct advantages and limitations.Traditional Surveying Methods:Transit stadia surveys and plane table surveys were widely used traditional surveying methods. These techniques relied on instruments like theodolites and stadia rods for measuring distances and angles,...
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Uniform Depth Channel Flow01:27

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Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
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Water flow in open channels is often measured using hydraulic structures such as weirs, which allow precise calculation of discharge. In a rectangular channel, flow rates are measured using three types of weirs: rectangular sharp-crested, triangular sharp-crested, and broad-crested. The weir head is set at a fixed height above the channel bottom, simplifying calculations and enabling the relationship between depth and flow rate to be analyzed.For the rectangular sharp-crested weir, the flow...
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相关实验视频

Updated: Jul 14, 2025

Watershed Planning within a Quantitative Scenario Analysis Framework
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使用随机森林模型对邻近的美国进行水表深度估计.

Yueling Ma1,2, Elena Leonarduzzi1,2, Amy Defnet1,2,3

  • 1High Meadows Environmental Institute, Princeton University, Princeton, NJ, USA.

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概括

一个新的数据驱动的随机森林模型准确地估计了整个连续的美国 (CONUS) 的水表深度 (WTD). 这种方法为大规模淡水资源评估提供了传统模型的可靠替代方案.

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科学领域:

  • 水文学和水文地质学
  • 地理空间数据科学数据科学
  • 环境建模环境建模

背景情况:

  • 水平面深度 (WTD) 显著影响地下水动态和陆地表面相互作用.
  • 有限的WTD观测对准确的大规模地下水建模提出了挑战.
  • 现有的基于物理的模型很难准确地代表观察到的WTD.

研究的目的:

  • 开发和验证一种纯粹基于数据的方法,以估计大陆范围内的WTD.
  • 评估随机森林 (RF) 模型在整个连续美国 (CONUS) 的WTD估计的性能.
  • 量化与射频模型的WTD预测相关的不确定性.

主要方法:

  • 应用了一个随机森林 (RF) 模型,使用可用的WTD观测数据来对CONUS进行估计.
  • 利用定量回归森林来量化预测不确定性.
  • 使用Pearson相关系数 (r),Nash-Sutcliffe效率 (NSE) 和根平均平方误差 (RMSE) 评估模型性能.

主要成果:

  • 射频模型与井观测结果达成高度一致 (r=0.96,NSE=0.93).
  • 位置被确定为WTD估计的最关键特征,可能充当空间替代品.
  • 高度的预测不确定性通常在浅水WTD地区被发现.

结论:

  • 数据驱动的射频模型为大规模WTD估计提供了基于物理的方法的强大而准确的替代方案.
  • 该模型为大陆范围的淡水资源提供了有价值的见解.
  • 经过训练的射频模型显示了可转移到具有类似水文制度和有限数据的其他地区的潜力.