Euro-limpacs Deliverables

ABSTRACT - DELIVERABLE 71

A report on the prototype version of INCA-SED and it?s application to an integrated catchment site

This report describes the development and preliminary application of a prototype version of a catchment−scale sediment delivery model for simulating in−stream suspended sediment concentrations in response to hydrologic forcing. This model is designed with an INCA−compatible structure, so that it can be linked to the INCA−P phosphorus model to simulate transport of the particulate phase but can also be run alone to simulate sediment delivery to and transfer in stream channel reaches. At this stage of model development, the INCA−Sed prototype model code is a C++ program, written by N P Jarritt, based on model equations developed by D S L Lawrence and N P Jarritt, and the equations and applications reported here refer to this prototype. Continuing work within the context of the Euro−limpacs project is concerned with incorporating these equations into an INCA user interface, so that the sediment delivery model can be applied by users to a wider range of users to European catchments.

The principal aim underlying the development of the prototype sediment delivery model is to develop a tool for simulating the time−dependent patterns of suspended sediment in channel reaches. In order for such a model to be a useful tool which can feasibly be applied to a range of catchments, it must satisfy the following criteria: 1) require only readily available data, rather than depend on specialised data from intensively instrument catchments; 2) use only a limited number of variables and parameters so as to avoid ?over parameterisation?; and 3) include only the dominant processes controlling sediment delivery and transfer from slopes to channel reaches and within the channel reaches comprising the INCA−style fluvial system.

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