A Dynamic Phosphorus
Transport Model CATCHLOAD:
The Case Study Of Lake Burtnieks, Latvia
Author(s)
Ä. Bilaletdin, T. Frisk & H. Kaipainen
Abstract
Eutrophication of lakes is one of the most serious environmental problems. The
aim of this study was to use a method developed for assessing dynamic
phosphorus transport from large drainage basins and also to assess the effects in
the target lake. The CATCHLOAD model consists of two compartments: a
runoff model and a nutrient transport model. It is possible to use different kinds
of runoff models in the CATCHLOAD. The statistical transport model calculates
the transport as a multiplication of runoff and concentration separately for
forested and agricultural areas of the catchment. The concentrations for forested
and agricultural areas are obtained using empirical functions. The CATCLOAD
simulates only the diffuse loading (agriculture and basic loading from forest) of
sub-catchments and for that reason the point and sparse population loading were
added to this simulated loading. The different versions of CATCHLOAD have
already been used successfully prior to this study.
In this study the runoff model METQ98 was used. The calibration results of
CATCHLOAD were rather accurate. To assess a loading simulation in the
future, different scenarios were formed. The main contributor to the loading is
agriculture and it is assessed that in the future the main changes in loading
happen only in agriculture due to the fertilization. The climate change scenarios
were also simulated and generally it can be noticed that the annual effect of
climate change on nutrient loading is smaller than the annual effect of calculated
agriculture scenarios on nutrient loading.
Keywords: nutrient loading, modelling, phosphorus, catchment, climate change,
CATCHLOAD.
Keywords
nutrient loading, modelling, phosphorus, catchment, climate change,
CATCHLOAD.
Related Book
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