A Practical Introduction to 2D River Modelling in HEC-RAS

A step-by-step guide to building, running and interpreting 2D models using RAS Mapper in HEC-RAS

4.64 (310 reviews)

Udemy

platform

English

language

Engineering

What you will learn

Learn to work with RAS Mapper within the HEC-RAS software environment to create terrain layers for 1 and 2D river modelling.

Learn how to import 1D cross-section data and use it to create a more accurate channel. network.

Learn how to create Landcover Layers and apply Manning’s n values.

Learn how to create a 2D mesh, set cell parameters and add Refinement Regions and Breaklines.

Learn how to build Lateral Structures in order to connect 1D to 2D elements.

Learn how to adjust a 2D area to create an optimal river channel mesh.

Learn how to enter unsteady flow Boundary Condition data and Initial Conditions.

Learn how to set up an Unsteady Run and about Computation Options and Tolerances.

Learn how to pick an appropriate time-step using the Courant Number.

Learn how to view 1D and 2D results and understand what the outputs mean.

Why take this course?

In this course you will learn, through 54 short video tutorials, how to construct a combined 1D-2D and a 2D-only river model in the HEC-RAS hydraulic modelling software package. This course, builds on my Udemy 1D HEC-RAS modelling course but is stand-alone and you do not need to take that course in order to follow and complete this one although it would be useful to have a basic understanding of general hydraulic modelling concepts.

All the data necessary to follow and build your models is supplied with this Udemy course and the HEC-RAS software itself is free to download from the web.

Much of the tutorial and model build will focus on the use of the RAS Mapper module within the HEC-RAS software environment. You will learn how to import terrain model data, modify it using surface interpolation techniques and how to create landuse data layers to generate roughness data. You will then go on to learn about 2D geometry creation, how to set cell size and how to adjust cell spacing and alignment to best represent the underlying terrain and likely flow patterns and, in your first model, you will then go on to create a lateral structure to connect 1D to 2D areas. In the second model that you build you will also learn how to represent a main river-channel within a 2D model surface. You will then learn how to enter boundary condition flow data and how to run model scenarios. Several of the tutorials are then focused on discussing both 1D and 2D computation options and tolerances and also how to set the computation interval based upon the Courant Number. You will learn about these various aspects of modelling by making adjustments to your model and then viewing the impact had on the computed results output. Finally, you will learn how to view and manipulate both 1D results in the main HEC-RAS software environment and 2D outputs in RAS mapper along with tips on how to best interrogate and display the output data.

This course will enable you to advance your hydraulic modelling skills from 1D-only simulations to 2D modelling within a geo-referenced terrain environment and as such it will stand you in good stead whether you study river channel processes in academia or work in the river engineering industry.

Screenshots

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Reviews

Andrew

October 5, 2023

Both the 1d and 2d courses are amazing. Tons of valuable and applicable lessons... build the models in real time with the course and you've got a great foundation. I'll surely be referring back to the course modules as I build my own!!! Thank you so much.

Alp

August 30, 2023

The content is sufficient to understand the concept of 2D modelling and RAS Mapper tool. However, it would be even better if there were more exercise opportunities with different modelling scenarios.

Michele

August 10, 2023

Another great introductory course. Looking forward to an updated section on Dam Breach or even a dedicated new course on it. Keep up the good work!

Hassan

June 17, 2023

It seems comprehensive but not too detailed. Wish there were more time on the common possible errors a learner might encounter. Overall it has been a great course so far.

Kapil

May 28, 2023

I am working in dam breach analysis project and A Practical Introduction to 2D River Modelling in HEC-RAS helped me understand the basics of software. It has helped me understand the importance of courant number and computation time step for smoother results. Overall, it was a wonderful course.

Bernard

May 25, 2023

Very informative class so far (completed the introduction). I liked the succinct definition of 1-D, 2-D, and 3-D modeling. Still very informative - I like the detailed explanation and interpretation of results from HEC-RAS. Instances where results can seem right yet are wrong and there is a need to modify the model. The appearance of results as influenced by rendering, underlying equations, interpolation, time steps, etc

Ogenrwoth

May 4, 2023

I like the introduction. So straight forward. Looking forward to become expert in 2D modelling using HEC-RAS

Vincent

February 28, 2023

Excellent course to get familiar with RAS for beginners. I'd recommend to anyone getting started with RAS. Explains topics well and why/how to use different features of the software.

Akanksha

November 1, 2022

very informative , gives solution to every problem that can come . simple to understand practice and follow . thank you soo much

Vivek

October 27, 2022

Detailed Information about 2D River Modeling and RAS Mapper. Need More Courses like this for HEC-HMS Also.

Luis

August 17, 2022

I have to say that the course is easy to follow, the explanations are very clear and I will highly recommend this course. On the hand, the time to answer the questions when I was stuck on a problem should be shorter.

Lisa

August 14, 2022

This course is exactly what I was looking for to advance my career. The instructor is paced and has assembled the class in a very logical way and I’m excited to continue.

DORNU

July 8, 2022

This was an excellent course that greatly aided my understanding of the concept of a 2-D model. I wholeheartedly recommend this course.

Ilçe

May 27, 2022

Good course overrall with detailed explanations for the methods, tools and options. However it would best that also there was an example with a bridge in a 2D model, so we can understand the methods used for creating and calculating the results. I have a big problem with the quality of terrain for my area in Europe. If you have any sources or for high quality DEM for Europe for hydrologic models I would really appreciate it. Thanks

Julio

May 21, 2022

I need to watch more about the course, but the initial explanaition of the instructor its easy to understand and he knows a lot of the course. Thank you.

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