Level 1
Simple Geomorphic Concepts and
Qualitative Analysis
↓
Level 2
Advanced Geomorphic Concepts and
Quantitative Engineering Analysis
↓
Level 3
Mathematical or Physical
Model Studies
Figure 9.1. Three-level analysis procedure for river engineering studies.
A Level 2 analysis involves a more detailed qualitative analysis combined with a quantitative
evaluation. Computation of water surface profiles using 1-dimensional computer models can
be included in this level of analysis. In many cases, the evaluation and analysis can be
considered adequate at this level if the goals are met, the interrelationship between different
aspects of the project and river system are adequately explained and all of the problems
resolved.
A Level 3 analysis involves mathematical or physical modeling of water and sediment. These
procedures are not always necessary. Water can be modeled using a steady or unsteady
flow rigid boundary flow model. In some cases, a movable boundary flow model can be
employed, routing both water and sediment through the study reach. Sediment routing
models will require a substantial historic data set and analysis time to calibrate and verify the
model. Experienced modelers should be employed if sediment routing is to be performed.
9.3.2 Project Initiation
The success of a project can be dramatically influenced by careful planning in the initial
stages of the project. The following guidelines will help insure the success of the project.
9.7
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