Delta Shell framework

Introduction

The Delta Shell framework is an integrated modelling environment which provides a platform that can be used to integrate various models, data and tools. It consists of a framework with a user interface which supporting several environmental models. The program is easy to configure and quick to learn. The graphically oriented interface is designed for intuitive use. The user can download information from a variety of standard data formats and GIS systems.

Delta Shell provides a user-friendly and open framework for hydraulic and hydrological applications. The figure below shows the principles of the Delta Shell framework. Delta Shell allows to combine different modules (plug-ins) related to water flow, such as D-Flow Flexible Mesh (D-Flow FM), D-Real Time Control, D-Water Quality, D-Hydrology. Delta Shell contains tools for setting up or importing different types of models, perform simulations of the different models or combinations of models and analyse model results. Delta Shell has an open architecture which allows integration of external software (deployed as a plug-in).

Layered Concept

A model is by definition a simplified version of (a possible) reality. A generic model is a mathematical description of physical processes provided as a computer program, for example D-Flow FM, which is a model of surface water flow that solves the Saint-Venant equations. D-Flow FM is a numerical model, because the governing flow equations are solved numerically. In combination with data for a specific part of the world the model becomes a site-specific model, for example the D-Flow FM-model for the river Rhine from Maxau to Lobith. Within a site-specific model a set of boundary conditions forms a scenario.

Delta Shell follows a layered concept to get from ‘real world’ to ‘numerical model result’ (see figure). Real objects like rivers, lakes, buildings, hills, bridges, pumps, culverts, etc. usually are available on maps or other (digital) format. Based on such data Delta Shell helps to create a schematization, i.e. a network with model objects that correspond to the real objects. The schematization makes the model site-specific. A computational grid is added, which is part of the discretization of real world processes like surface water flow into a numerical model. This model can be run under different sets of boundary conditions (scenarios). Numerical solution of the flow equations with a Delta Shell plugin finally produces model results.