Physically Based Model Of Soil Erosion And
Pollutant Dynamics At A Basin Scale
Author(s)
M. Ferraresi & S. Longo
Abstract
In this paper we describe a conceptual model for evaluating sediment transport
and pollutants dynamics (BOD, P and N) at a basin scale. The sediment transport
model is physically based; the pollutant dynamics model is based on an integral
and simplified form of the complex equations. The model was numerically
implemented and applied to four catchments in the Po River Area, with
extensions ranging from 460–2150 km 2 . The topology is described by DEM with
cells of 250x250 m 2 . The time step is 24 h. The model was calibrated using data
measured in the main streams in the period 1993–1999.
Keywords: pollutant dynamics; sediment transport; basin management.
1 Introduction
The study \“Analysis of floods in relation to factors influencing nourishing
compounds in the basins of the tributaries of Po River”, developed by Agenzia
Regionale Prevenzione e Ambiente dell’Emilia-Romagna (ARPA [1]) reports on
sediment transport and quality of surface water in the main basins in Emilia
Romagna, through numerical models.
The analysed chemical parameters are Nitrogen, as ammonia, nitric and
nitrous, Phosphorus and BOD, hereafter defined as nutrients, and sediment
transport. Due to the large time span (1993-99), and large modelled areas (more
than 6000 km 2 ) of the basins (Nure, Taro, Secchia and Panaro rivers), the
available information allowed only some simplified representations of the
phenomena.
In the full model stream and catchment processes were separated (but linked):
in the present paper only sediment transport and chemical dynamics (nutrients)
in the catchment are described. A hydrologic module (ARPA [1]) is used to
model fluid discharge on a daily rate.
Keywords
pollutant dynamics; sediment transport; basin management.
Related Book
Other papers in this volume
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