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相关概念视频

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

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

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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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Design Example: Creating a Hydraulic Model of a Dam Spillway01:21

Design Example: Creating a Hydraulic Model of a Dam Spillway

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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.
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Distributed Loads: Problem Solving01:21

Distributed Loads: Problem Solving

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Beams are structural elements commonly employed in engineering applications requiring different load-carrying capacities. The first step in analyzing a beam under a distributed load is to simplify the problem by dividing the load into smaller regions, which allows one to consider each region separately and calculate the magnitude of the equivalent resultant load acting on each portion of the beam. The magnitude of the equivalent resultant load for each region can be determined by calculating...
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Design Example: Calculating Safe Diameter for Wind-Exposed Disc01:17

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Assessing safety in wind-exposed installations is crucial to preventing potential failures. This example explores the calculation and design adjustments needed to mount a circular disc on a building facade, where wind forces are a primary concern. A 4-meter diameter disc was initially designed as an aesthetic feature facing winds at a velocity of 25 meters per second, with an air density of 1.25 kilograms per cubic meter. Given these conditions, the drag force on the disc was determined using...
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Applications of GIS: Disaster Management and Emergency Response01:29

Applications of GIS: Disaster Management and Emergency Response

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Geographic Information System (GIS) technology is essential for risk identification, action prioritization, and resource optimization in critical situations like flooding and earthquakes. By integrating spatial and demographic data, GIS provides a comprehensive framework for emergency response.GIS integrates data layers, like rainfall intensity, topography, elevation profiles, and river levels, to model high-risk flood zones. These layers assess areas susceptible to flooding based on their...
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Flow Table Test01:12

Flow Table Test

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The flow table test is an established method used to assess the workability of concrete, particularly useful for evaluating highly flowable concrete mixes. This test employs an apparatus that consists of a wooden board topped with a steel plate, collectively weighing 35 pounds. The board is connected to a base via a hinge and measures 27.6 inches on each side.
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Updated: Jun 23, 2025

Watershed Planning within a Quantitative Scenario Analysis Framework
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基于t分布和线性编程优化算法的碎片流风险评估的组合权重方法.

Li Li1, Hanjie Lin1, Yue Qiang1

  • 1Civil Engineering College, Chongqing Three Gorges University, Wanzhou, Chongqing, China.

PloS one
|June 14, 2024
PubMed
概括
此摘要是机器生成的。

本研究引入了一种使用t分布和线性编程优化算法 (LPOA) 的新型废料流风险评估方法,通过考虑指标重要性和废料流频率来更准确地评估风险,改进了传统技术.

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Last Updated: Jun 23, 2025

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科学领域:

  • 地质科学 地质科学
  • 自然危害评估自然危害评估
  • 风险管理 风险管理

背景情况:

  • 碎片流风险评估对于预防和控制项目至关重要.
  • 现有的方法往往过度强调客观或主观指标,忽视指标相互作用.
  • 像EWM和VCM这样的传统方法忽视了碎片流动频率对风险的影响.

研究的目的:

  • 为碎片流风险评估提出一种新的重量计算方法.
  • 整合t分布和线性编程优化算法 (LPOA) 进行可靠的权重.
  • 通过避免过度强调单一指标并纳入频率效应来提高风险评估的准确性.

主要方法:

  • 使用分析层次过程 (AHP),重法 (EWM) 和变化系数法 (VCM) 获得的初始权重.
  • 在各种置信级别使用t分布确定权重区间.
  • 用LPOA计算的最终重量,在90%的置信区间内,用于碎片流风险评分.

主要成果:

  • 拟议的方法避免了与EWM和VCM相比过度强调个别指标.
  • 聚变权衡方法有效地纳入了碎片流动频率,这是EWM和VCM错过的一个因素.
  • 在北川县,评估了72个碎片流,其中大多数被归类为中度和轻度风险 (8高,24中度,40轻度).

结论:

  • 开发的聚变权重方法为碎片流风险评估提供了更合理,更全面的方法.
  • 该方法能够避免单一指标偏差并包括频率效应的能力提高了其适用性.
  • 结果为组合权重方法和碎片流风险管理策略提供了宝贵的见解.