Related Experiment Video
Updated: Jul 18, 2026

Visualizing Hyporheic Flow Through Bedforms Using Dye Experiments and Simulation
Published on: November 18, 2015
One-dimensional GIS-based model compared with a two-dimensional model in urban floods simulation
Abstract:
A GIS-based one-dimensional flood simulation model is presented and applied to the centre of the city of Nîmes (Gard, France), for mapping flow depths or velocities in the streets network. The geometry of the one-dimensional elements is derived from the Digital Elevation Model (DEM). The flow is routed from one element to the next using the kinematic wave approximation. At the crossroads, the flows in the downstream branches are computed using a conceptual scheme. This scheme was previously designed to fit Y-shaped pipes junctions, and has been modified here to fit X-shaped crossroads. The results were compared with the results of a two-dimensional hydrodynamic model based on the full shallow water equations. The comparison shows that good agreements can be found in the steepest streets of the study zone, but differences may be important in the other streets. Some reasons that can explain the differences between the two models are given and some research possibilities are proposed.
Related Concept Videos
Applications of GIS: Disaster Management and Emergency Response
Typical Model Studies
Design Example: Analyzing Capacity Contours for Flood Risk Assessment
Selected Data About Geographic Locations
Modeling and Similitude
Design Example: Creating a Hydraulic Model of a Dam Spillway

