相关实验视频
Updated: Jun 9, 2025

12:44
Watershed Planning within a Quantitative Scenario Analysis Framework
Published on: July 24, 2016
8.0K
将曲线数与环境流量联系起来:一种新的方法
Shailendra Kumar Kumre1, Sabyasachi Swain2,3, Kumar Amrit4
1National Institute of Hydrology, Roorkee, 247667, India. skumre159@gmail.com.
Environmental science and pollution research international
|October 21, 2024
概括
对于河流健康至关重要的环境流量可以使用多功能曲线数 (CN) 指数进行预测. 这项研究确定了印度河流盆地%AAF和CN之间的强有力的线性相关性,有助于环境流量管理.
科学领域:
- 水文学的水文学
- 环境科学 环境科学
- 水资源管理 水资源管理
背景情况:
- 河流流程对水生生态系统和生态系统服务产生重大影响.
- 环境流动对于保持河流生态系统完整性至关重要.
- 田纳特的方法是定义环境流动的标准.
研究的目的:
- 为了将环境流量 (Tennant的方法) 与曲线数 (CN) 指数相关联.
- 通过印度河流盆地的降雨-流水数据,调查%AAF和CN之间的关系.
- 根据水域特征,评估CN对预测环境流量的有用性.
主要方法:
- 利用了来自印度五大河流盆地 (布拉姆尼-拜塔拉尼,戈达瓦里,玛哈纳迪,马希,纳尔马达) 的17个流域的降雨流量数据.
- 在低流量季节 (10月至6月) 的平均年流量百分比 (%AAF) 和曲线数 (CN) 之间的关系.
- 与标准流量指数 (SQI) 相关联的CN,变化为%AAF.
主要成果:
- 在%AAF和CN.之间发现了强烈的线性相关性 (R>0.7对于16/17种采集区).
- %AAF随着CN的增加线性增加,反之亦然.
- 在Dhariawad (R2=0.899) 和Baronda (R2=0.814) 水域观察到最大的相关性,这表明了良好的关系.
结论:
- 曲线数 (CN) 指数是基于采水区特征的环境流量 (%AAF) 的可靠预测指标.
- 建立的关系为数据稀缺地区的环境流量评估和管理提供了有价值的工具.
- CN和SQI之间的相关性进一步验证了CN在水文研究中的发现和适用性.
相关概念视频
Design Example: Analyzing Capacity Contours for Flood Risk Assessment
40
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...
40
Rapidly Varying Flow
53
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...
53
Design Example: Creating a Hydraulic Model of a Dam Spillway
127
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.
127
Gradually Varying Flow
34
Gradually varying flow (GVF) in open channels describes situations where water depth changes slowly along the channel due to factors like non-uniform bed slope, channel shape variations, or obstructions. This flow type occurs when the depth adjusts gradually to balance gravitational forces, shear forces, and energy requirements, resulting in a low rate of depth change.Characteristics of Gradually Varying FlowGVF is commonly observed in natural streams, rivers, and canals, where flow depth...
34
Typical Model Studies
340
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.
340
Design Example: Setting a Curve Using Design Data
21
Designing and plotting a curve using field data requires precise calculations and execution. A horizontal curve with a radius of 200 meters and an intersection angle of 20 degrees is established using the method of perpendicular offsets from the long chord. The long chord, which spans between the curve's endpoints, is calculated to be 69.46 meters in length. To maintain accuracy in plotting, intervals of 3 meters are selected along the chord.The engineer determines the offset distances for each...
21

