Use of Standard 2D Numerical Modeling Tools to Simulate Surface Runoff Over an Industrial Site: Feasibility and Comparative Performance Survey Over a Test Case

Abstract

Intense pluvial generated surface flow over an industrial facility represents a flood risk requiring an appropriated approach for risk assessment. Runoff over industrial site might have flow regime changes, wild flooding/drying extend, as well as small water deep properties. This makes standard bidimensional (2D) numerical surface flow models use particularly challenging. Indeed, numerical treatment of these properties might not be specifically supported by models. Furthermore, it gets close by their traditional application domain limits. Accordingly, an assessment of this group of numerical tool use for such a purpose needs to be in detailed studied to evaluate feasibility, performance, and relevance of their use in this context. This chapter aims to focus on common 2D numerical modeling tools use for application over an industrial plant test case to simulate surface runoff scenarios. Feasibility of such an approach is hereby studied. Performances and relevance of this attempt are evaluated. Our test case has specificities of real industrial plants in terms of domain extend, topography, and surface drainage structures. Tested scenarios state a uniform net 100 mm 1 h long rainfall event in a context of storm water sewer pipe failure. Selected tested models were a 2D finite differences diffusive wave model and an array of different 2D shallow water equation [2D shallow water equations (SWEs)]–based models. Comparison has been conduced over computed maximal water depth and water deep evolution. Results reveal a feasibility of these tools application for the studied specific purpose. They underline the necessity of a highly fine spatial and temporal discretization. Tested categories of average 2D SWEs–based models show in a large extend similar results in water depth calculation. Used indicator of results reliability estimation did not point out major critical aspects in calculation. Limits inherent of these categories of models use for this domain of application are underlined. Relevance of this approach is raised up.