Using RAS Mapper as a GIS Tool Part 1: Removing Bridge Decks from Terrain Surfaces This is the first in a three-part series on using RAS Mapper as a GIS tool. In this post we’ll cover the removal of bridge decks from terrain data. This topic comes up fairly frequently, since LiDAR data may be […]
Terrain Modification Two previous blog posts have addressed terrain modification in HEC-RAS (the December 2014 article entitled Including Channel Bathymetry into your Terrain and the June 2015 article entitled Lifting Terrain in HEC-RAS 5.0). These have been some of the most popular posts to date, each having generated almost 10,000 views over the years! Interchangeably referred to […]
I’ve been seeing some cool applications of HEC-RAS from around the world lately. Here are some articles showing a few ways we’ve been putting HEC-RAS to use down under. Making Middle Zealand Did you know that the only thing keeping New Zealand’s two main islands from being split into three is a little 2-km wide […]
New geospatial editing tools are currently in development for the next version of HEC-RAS-Version 5.1. While no date has been set for the release of Version 5.1, it is expected sometime within the next year or two. But no guarantees! This will be an exciting new addition to HEC-RAS in that users will no longer […]
***Update: I received a few very important comments about this post that I want to share. First, and this is very important: These methods are not meant to be used to do any kind of detailed bridge design or bridge scour analysis (contraction, abutment, or pier scour). The methods I present in this post are […]
We often have to deal with very large models covering hundreds of river miles. The terrain data associated with these models can be equally massive, which can cause memory/processor issues when trying to delineate inundation maps. This post is not concerned with pre-processing our model geometry. Instead, we have a completed model with results we […]
To follow up my post on fragmented inundation, I want to highlight another 2D mesh issue we should all be aware of. Unlike fragmented inundation, which is an artifact of how HEC-RAS discretizes the 2D domain and the way it maps the results, Leaking is a result of terrain features not aligning with cell faces […]
Let’s say you have a digital terrain model of the area you want to model with 2D HEC-RAS. ONLY 2D RAS. In other words, you want to lay out a grid, but do not want to have do to any 1D computations-all 2D. The problem is the area you want to model includes one or […]