Related Experiment Video
Updated: May 23, 2025
07:15
Parameterizing V-notch Weir Equations for Flow Monitoring in a Drainage Control Structure
Published on: April 25, 2025
118
Jacking characterization of compound flooding on drainage network based on physical model experiment and numerical
Yunchao Zhuang1, Kui Xu1, Lingling Bin2
1State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation, Tianjin University, Tianjin 300350, PR China; School of Civil Engineering, Tianjin University, Tianjin 300350, PR China.
Water Research
|May 21, 2025
Summary
Compound flooding’s jacking effect on coastal drainage networks is clarified. High tide and river levels interact, impacting drainage capacity, with effects lessening as rainfall intensity increases.
Area of Science:
- Coastal engineering
- Hydrology
- Urban water management
Background:
- Coastal drainage networks face reduced capacity due to compound flooding.
- The 'jacking effect' of high tide and river levels is a key factor, but its mechanism is not fully understood.
Purpose of the Study:
- To analyze the jacking effect of high tide and river levels on drainage networks.
- To understand the interaction and feedback between tide, river, and drainage systems during compound flooding.
Main Methods:
- Physical model construction based on kinematic, dynamic, and geometric similarity.
- Numerical simulation using the PCSWMM model.
- Coupled physical-numerical modeling with a water tracer method.
Main Results:
- Models demonstrate high simulation accuracy.
- Jacking effect intensity and extent decrease with increased rainfall intensity.
- Pipeline impact percentages were 52.6% (50-year rainfall) and 60.9% (20-year rainfall).
- Tide and river level effects interact inversely, with tide's effect strongest at the outfall.
Conclusions:
- The study quantifies the jacking effect of tide and river levels on drainage networks.
- Provides insights into the occurrence mechanism of compound flooding.
- Offers a theoretical basis for coastal drainage system design and management.
Related Concept Videos
01:27Design Example: Design of an Irrigation Channel
52
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...
52
01:17Design Example: Analyzing Capacity Contours for Flood Risk Assessment
35
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...
35
01:14Conservation of Mass in Moving, Nondeforming Control Volume
719
Stormwater detention basins are essential in managing runoff during heavy rainfall, particularly in urban areas where impervious surfaces increase the risk of flooding. Understanding the conservation of mass in these systems allows engineers to optimize basin performance, balancing inflow, outflow, and water storage.
In the context of a detention basin, the conservation of mass states that the total mass of water entering the basin must equal the mass leaving the basin plus any accumulation of...
In the context of a detention basin, the conservation of mass states that the total mass of water entering the basin must equal the mass leaving the basin plus any accumulation of...
719
01:30Underflow Gates
33
Underflow gates are vital for controlling water flow in irrigation canals. The three main types of underflow gates — vertical, radial, and drum gates — serve different purposes while ensuring effective flow management. Vertical gates move up and down, generating a free-flowing water jet; radial gates pivot to regulate the flow; and drum gates rotate for precise adjustments. The flow through these gates is influenced by downstream conditions, resulting in free or drowned outflow.Free and...
33
01:19Design Example: Maintaining Level of an Embankment
48
Constructing a roadway embankment over uneven terrain requires precise leveling to ensure stability and proper drainage. Surveyors use a leveling instrument and staff to calculate ground elevations and determine the required fill material at each point along the embankment alignment.The process begins by positioning a leveling instrument near a benchmark with a known elevation. A backsight reading establishes the instrument height, which serves as a reference for subsequent measurements. A...
48
01:29Hydraulic Jump
36
A hydraulic jump is a sudden rise in fluid depth in open channels, occurring when high-velocity (supercritical) flow transitions to low-velocity (subcritical) flow. This phenomenon requires an upstream Froude number greater than 1, as flows with Fr1<1 remain subcritical, making a hydraulic jump impossible due to the need for negative head loss, which violates thermodynamic principles.The characteristics of a hydraulic jump depend on the upstream Froude number and are classified as...
36