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1  Introduction

This tutorial document will guide you how to setup a coastal sediment model based on the Tra_Khuc Estuary example that is available from the EEMS website. It is assumed in the following guidance that the hydrodynamic model of Tra_Khuc has been set  so that the sediment transport can be added to this model. The hydrodynamic model need can be downloaded from this link Build a 3D Coastal Model .

2  Generate a Sediment Transport Model

Open the Tra Khuc Hydrodynamic Model (Figure 13D Coastal Sediment Model - Tra_Khuc Estuary).

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Figure 1.  EE main form of Tra_Khuc Hydrodynamic Model.

2.1 Activate Sediment Modules

1. In the Model Control form, RMC on Modules to open the EFDC Modules window. 
2. In EFDC Modules, check the boxes (Original) Cohesive Sediments and (Original) Non-Cohesive Sediments  to activate sediment then click OK. The Sediments item will be added under Modules.

Figure 2.  Activate the sediment module.

2.2 Set Sediment Transport Parameters and Options

1. Right Mouse Click on Sediments tab under Modules then click Settings to open Sediments and Sediment Bed Properties window (Figure 33D Coastal Sediment Model - Tra_Khuc Estuary).
2. In the General tab the user inputs the number of Sediment Bed Layers, Cohesives, and Non-cohesives (Figure 43D Coastal Sediment Model - Tra_Khuc Estuary)

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Figure 4.  Sediment Transport – General tab.

Cohesives Tab

The user should input the values as shown in Figure 5 3D Coastal Sediment Model - Tra_Khuc Estuary for the cohesive class. 

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Figure 5.  Sediment Transport – Cohesives tab.

Non-Cohesives Suspended Tab

The user ahould input values for IC WC Conc, IC Bed Mass, Specific Gravity, and Median Diameter as shown in Figure 6 3D Coastal Sediment Model - Tra_Khuc Estuary. In the Equilibrium Conc, check on Van Rijin then click Set Parameters to initialize the sediment properties using the Van Rijn equations.

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Figure 6.  Sediment Transport – Non-Cohesives Suspended tab.

Non-Cohesives Bedload

The Non-Cohesives Bedload tab is shown in Figure 7 3D Coastal Sediment Model - Tra_Khuc Estuary. Pressing the Initialize Constants button will bring up a dialog box asking the user to select the bedload approach to use (Figure 83D Coastal Sediment Model - Tra_Khuc Estuary). EFDC_Explorer sets the bed load transport constants to standard literature values for the computational approach selected.

Enter "1" then click OK button. Click Set All button to set all non-cohesive bedload to the current class (Figure 73D Coastal Sediment Model - Tra_Khuc Estuary).

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Figure 8  Bedload Constants Initialization form.

Morphology and Consolidation Tab

The Morphology & Consolidation  tab of the sediment properties option is shown in Figure 9 3D Coastal Sediment Model - Tra_Khuc Estuary. In this tab the user may specify various bed consolidation and bed morphology settings.

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Figure 9  Sediment Transport – Morphology and Consolidation tab.

Bed Processes

The Bed Processes is shown in Figure 10 3D Coastal Sediment Model - Tra_Khuc Estuary.

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Figure 10.  Sediment Transport – Bed Processes tab.

Initial Conditions Tab

There are several ways to build sediment beds in EFDC_Explorer. The simplest option is to create a uniform bed as shown in Figure 11 3D Coastal Sediment Model - Tra_Khuc Estuary. Other option, using a sediment cores with grain-size which is described in Sediment Bed Core Initialization.

The sediment parameters form with the Initial Conditions tab selected is shown in Figure 11 3D Coastal Sediment Model - Tra_Khuc Estuary.

1. Select Spatially Varying Bed Conditions; Specify Mass Fraction
2. Click Create Assign Bed IC button, Initialization of Sediment Beds window will appear (Figure 123D Coastal Sediment Model - Tra_Khuc Estuary). Click on Create Uniform Bed.
3. Inorganic Sediment Bed Constructor window appears, enter values for uniform cohesives and non-cohesives as shown in Figure 13 3D Coastal Sediment Model - Tra_Khuc Estuary
4. Then click Create Sediment Bed button
5. Click on OK

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Figure 13.  Uniform Sediment Bed Generation form.

2.3 Set Up Boundary Conditions for Sediment

1. From Model Control form, under External Forcing Data, RMC on Cohesives Sediment and select  Add New Data Series (See Figure 14 3D Coastal Sediment Model - Tra_Khuc Estuary) then the Boundary Data Series form appears.

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4. Enter time-series data of cohesive sediment from Figure 14 from 3D Coastal Sediment Model - Tra_Khuc Estuary then click OK button to finish.

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5. Add data time series for Non-Cohesives Sediment as shown in Figure 16 and Figure 17 3D Coastal Sediment Model - Tra_Khuc Estuary and 3D Coastal Sediment Model - Tra_Khuc Estuary (remember to put in data for 3 non-cohesive classes)

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Figure 17. Non-cohesive sediment data series.

2.4 Assigning the sediment concentration BC

1. Return to the Model Control form, RMC on the River under Flow of the Boundary Conditions tab then select Edit Boundary Group (Figure 183D Coastal Sediment Model - Tra_Khuc Estuary)

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2. The Flow Boundary Conditions form appears as shown in Figure 19 3D Coastal Sediment Model - Tra_Khuc Estuary, in Boundary Group Conditions, from drop-down list, select data series with named as "River" for Cohesive Sediment and Non-cohesive Sediments , then OK button.

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Figure 19.  Boundary Condition Definition/Groups form.

3  Save and Run Sediment Model

1. Click the Save Project button  on the top of EE form to save the model again as shown in Figure 20 3D Coastal Sediment Model - Tra_Khuc Estuary.
2. Click the Run EFDC  button, the EFDC+ Run Options frame appears as shown in Figure 21 3D Coastal Sediment Model - Tra_Khuc Estuary. On this form, the user can set the number of threads, output interval then browse to the EFDC+ executable file. Then click Run EFDC+ button to run model.
3. The EFDC+ run window is shown in Figure 22 3D Coastal Sediment Model - Tra_Khuc Estuary.

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#Figure 20 #Figure 20

Figure 20.  Save and run model.

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Figure 21.  EFDC+ Run Options.

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