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相关概念视频

Rapidly Varying Flow01:24

Rapidly Varying Flow

56
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
56
Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design 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
Hydraulic Jump: Problem Solving01:16

Hydraulic Jump: Problem Solving

55
To analyze a hydraulic jump in a rectangular channel with a flow speed of 6 meters per second, follow these steps:Calculate Effective Upstream Velocity:When the downstream gate closes, a hydraulic jump forms, traveling upstream at 2 meters per second. This wave speed combines with the initial channel flow velocity, creating an effective upstream velocity.Identify Flow Velocities Before and After the Hydraulic Jump:Upstream of the hydraulic jump, the effective flow velocity includes both the...
55
Design Example: Creating a Hydraulic Model of a Dam Spillway01:21

Design Example: Creating a Hydraulic Model of a Dam Spillway

146
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.
146
Design Example: Measuring Distance Between Two Points with Obstructions01:10

Design Example: Measuring Distance Between Two Points with Obstructions

28
When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
28
Design Example: Design of an Irrigation Channel01:27

Design Example: Design of an Irrigation Channel

81
Trapezoidal channels are widely used in irrigation systems due to their cost-effectiveness and efficiency in conveying water. Trapezoidal channels feature a flat bottom and sloping sides, making them stable and easier to construct compared to other shapes. The bottom width and side slope ratio are determined based on the required flow capacity and site conditions. The side slope is kept gentle for unlined channels to prevent soil erosion.Hydraulic parameters in channel design include the flow...
81

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相关实验视频

Updated: Jun 14, 2025

Evaluation of an Exclusive Spur Dike U-Turn Design with Radar-Collected Data and Simulation
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根据DFP-P-LK算法测量河流表面速度,以快速应对突发事件的突发事件.

Zhao-Dong Xu1, Zhi-Wei Zhang2, Ying-Qing Guo2

  • 1China-Pakistan Belt and Road Joint Laboratory on Smart Disaster Prevention of Major Infrastructures, Southeast University, Nanjing 210096, China.

Sensors (Basel, Switzerland)
|August 29, 2024
PubMed
概括

气候变化增加了堤破裂的风险. 一个新的动态特征点金字塔卢卡斯-卡纳德 (DFP-P-LK) 算法快速测量河流表面速度,以有效应对洪水紧急情况,显示高可靠性.

关键词:
动态更新机制 动态更新机制功能点融合检测检测功能点融合检测光学流量估计的估计.河流表面速度 河流表面速度

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科学领域:

  • 环境科学环境科学
  • 水文学的水文学
  • 遥感是一种远程传感.

背景情况:

  • 气候变化和极端天气事件增加了堤破裂和随后洪水的风险.
  • 精确的河流表面速度测量对于在堤破裂时有效的应急响应计划至关重要.
  • 视频图像速度测量为流速评估提供了一种非侵入性,用户友好和具有成本效益的方法.

研究的目的:

  • 引入一种新的光流算法,即动态特征点金字塔Lucas-Kanade (DFP-P-LK),用于增强特征点提取和跟踪.
  • 建议使用DFP-P-LK算法测量河流表面速度模型,以快速应对堤突破的紧急情况.
  • 通过将光学流量数据转换为实际流速,为应急管理提供关键数据支持.

主要方法:

  • 开发和实施动态特征点金字塔卢卡斯-卡纳德 (DFP-P-LK) 光流算法与动态特征点更新融合策略.
  • 功能点融合检测和动态更新机制,以确保可靠的光学流量估计.
  • 将DFP-P-LK算法集成到河面速度测量模型中,包括光学流速转换组件.

主要成果:

  • 通过动态特征点管理,DFP-P-LK算法在光流估计中表现出增强的稳定性.
  • 拟议的河面速度测量模型有效地将光学流动转换为实际流速.
  • 实验验证显示,在0.43m/s至2.06m/s的速度下,平均测量误差低于15%.

结论:

  • DFP-P-LK算法和相关的速度测量模型为快速的河流表面速度评估提供了可靠和实用的解决方案.
  • 这种方法在防突破紧急情况下提供了重要的价值,以支持及时和知情的决策.
  • 该方法的准确性和可靠性有助于改善洪水易发地区的环境监测和公共安全战略.