Longshore Current at Mid-Surf Zone Calculator

✖Root Mean Square Wave Height is a parameter influencing the Breaker Height Index that is commonly used to define the wave height at breaking in the saturated zones.ⓘ Root Mean Square Wave Height [H_rms]			+10% -10%
✖Wave Crest Angle is the angle at which the crest of a wave approaches or intersects with another medium, such as the shoreline or another wave.ⓘ Wave Crest Angle [α]			+10% -10%

✖Longshore Current at the Mid-Surf Zone is the current generated when a train of waves reaches the coastline and releases bursts of energy.ⓘ Longshore Current at Mid-Surf Zone [V_mid]

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Longshore Current at Mid-Surf Zone Solution

STEP 0: Pre-Calculation Summary

Formula Used

Longshore Current at the Mid-Surf Zone = 1.17*sqrt([g]*Root Mean Square Wave Height)*sin(Wave Crest Angle)*cos(Wave Crest Angle)
V_mid = 1.17*sqrt([g]*H_rms)*sin(α)*cos(α)
This formula uses 1 Constants, 3 Functions, 3 Variables

Constants Used

[g] - Gravitational acceleration on Earth Value Taken As 9.80665

Functions Used

sin - Sine is a trigonometric function that describes the ratio of the length of the opposite side of a right triangle to the length of the hypotenuse., sin(Angle)
cos - Cosine of an angle is the ratio of the side adjacent to the angle to the hypotenuse of the triangle., cos(Angle)
sqrt - A square root function is a function that takes a non-negative number as an input and returns the square root of the given input number., sqrt(Number)

Variables Used

Longshore Current at the Mid-Surf Zone - (Measured in Meter per Second) - Longshore Current at the Mid-Surf Zone is the current generated when a train of waves reaches the coastline and releases bursts of energy.
Root Mean Square Wave Height - (Measured in Meter) - Root Mean Square Wave Height is a parameter influencing the Breaker Height Index that is commonly used to define the wave height at breaking in the saturated zones.
Wave Crest Angle - (Measured in Radian) - Wave Crest Angle is the angle at which the crest of a wave approaches or intersects with another medium, such as the shoreline or another wave.

STEP 1: Convert Input(s) to Base Unit

Root Mean Square Wave Height: 0.479 Meter --> 0.479 Meter No Conversion Required
Wave Crest Angle: 60 Degree --> 1.0471975511964 Radian (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

V_mid = 1.17*sqrt([g]*H_rms)*sin(α)*cos(α) --> 1.17*sqrt([g]*0.479)*sin(1.0471975511964)*cos(1.0471975511964)

Evaluating ... ...

V_mid = 1.09803097681867

STEP 3: Convert Result to Output's Unit

1.09803097681867 Meter per Second --> No Conversion Required

FINAL ANSWER

1.09803097681867 ≈ 1.098031 Meter per Second <-- Longshore Current at the Mid-Surf Zone

(Calculation completed in 00.004 seconds)

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Home » Engineering » Civil » Coastal and Ocean Engineering » Surf Zone Hydrodynamics » Nearshore Currents » Longshore Current » Longshore Current at Mid-Surf Zone

Credits

Created by Mithila Muthamma PA

Coorg Institute of Technology (CIT), Coorg

Mithila Muthamma PA has created this Calculator and 2000+ more calculators!

Verified by M Naveen

National Institute of Technology (NIT), Warangal

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< Longshore Current Calculators

Longshore Current Speed

LaTeX Go Longshore Current Speed = (5*pi/16)*tan(Modified Beach Slope)*Breaker Depth Index*sqrt([g]*Water Depth)*sin(Wave Crest Angle)*cos(Wave Crest Angle)/Bottom Friction Coefficient

Ratio of Wave Group Speed and Phase Speed

LaTeX Go Ratio of Wave Group Speed and Phase Speed = (Radiation Stress Component*8)/(Mass Density*[g]*Wave Height^2*cos(Wave Crest Angle)*sin(Wave Crest Angle))

Radiation Stress Component

LaTeX Go Radiation Stress Component = (Ratio of Wave Group Speed and Phase Speed/8)*Mass Density*[g]*(Wave Height^2)*cos(Wave Crest Angle)*sin(Wave Crest Angle)

Wave Height given Radiation Stress Component

LaTeX Go Wave Height = sqrt((Radiation Stress Component*8)/Mass Density*[g]*cos(Wave Crest Angle)*sin(Wave Crest Angle))

Longshore Current at Mid-Surf Zone Formula

LaTeX Go

Longshore Current at the Mid-Surf Zone = 1.17*sqrt([g]*Root Mean Square Wave Height)*sin(Wave Crest Angle)*cos(Wave Crest Angle)
V_mid = 1.17*sqrt([g]*H_rms)*sin(α)*cos(α)

What is Longshore Drift & Longshore Current?

Longshore drift from longshore current is a geological process that consists of the transportation of sediments along a coast parallel to the shoreline, which is dependent on oblique incoming wave direction.
Wave and Wind induced longshore currents flow parallel to the shoreline and are strongest in the surf zone, decaying rapidly seaward of the breakers. These currents are generated by gradients in momentum flux (radiation stress) due to the decay of obliquely incident waves and the longshore component of the wind.

What is Wave setup and Wave set down?

In fluid dynamics, wave setup is the increase in mean water level due to the presence of breaking waves. Similarly, wave set down is a wave-induced decrease of the mean water level before the waves break.

How to Calculate Longshore Current at Mid-Surf Zone?

Longshore Current at Mid-Surf Zone calculator uses Longshore Current at the Mid-Surf Zone = 1.17*sqrt([g]*Root Mean Square Wave Height)*sin(Wave Crest Angle)*cos(Wave Crest Angle) to calculate the Longshore Current at the Mid-Surf Zone, The Longshore Current at Mid-Surf Zone formula is defined as the ocean current that moves parallel to shore caused by large swells sweeping into the shoreline at an angle and pushing water down the length of the beach in one direction. Longshore Current at the Mid-Surf Zone is denoted by V_mid symbol.

How to calculate Longshore Current at Mid-Surf Zone using this online calculator? To use this online calculator for Longshore Current at Mid-Surf Zone, enter Root Mean Square Wave Height (H_rms) & Wave Crest Angle (α) and hit the calculate button. Here is how the Longshore Current at Mid-Surf Zone calculation can be explained with given input values -> 1.098031 = 1.17*sqrt([g]*0.479)*sin(1.0471975511964)*cos(1.0471975511964).

FAQ

What is Longshore Current at Mid-Surf Zone?

The Longshore Current at Mid-Surf Zone formula is defined as the ocean current that moves parallel to shore caused by large swells sweeping into the shoreline at an angle and pushing water down the length of the beach in one direction and is represented as V_mid = 1.17*sqrt([g]*H_rms)*sin(α)*cos(α) or Longshore Current at the Mid-Surf Zone = 1.17*sqrt([g]*Root Mean Square Wave Height)*sin(Wave Crest Angle)*cos(Wave Crest Angle). Root Mean Square Wave Height is a parameter influencing the Breaker Height Index that is commonly used to define the wave height at breaking in the saturated zones & Wave Crest Angle is the angle at which the crest of a wave approaches or intersects with another medium, such as the shoreline or another wave.

How to calculate Longshore Current at Mid-Surf Zone?

The Longshore Current at Mid-Surf Zone formula is defined as the ocean current that moves parallel to shore caused by large swells sweeping into the shoreline at an angle and pushing water down the length of the beach in one direction is calculated using Longshore Current at the Mid-Surf Zone = 1.17*sqrt([g]*Root Mean Square Wave Height)*sin(Wave Crest Angle)*cos(Wave Crest Angle). To calculate Longshore Current at Mid-Surf Zone, you need Root Mean Square Wave Height (H_rms) & Wave Crest Angle (α). With our tool, you need to enter the respective value for Root Mean Square Wave Height & Wave Crest Angle and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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