A sub-catchment based approach for modelling nutrient dynamics and transport at a river basin scale

Article

Alam, Md Jahangir and Dutta, Dushmanta. 2016. "A sub-catchment based approach for modelling nutrient dynamics and transport at a river basin scale." Water Resources Management. 30 (14), pp. 5455-5478. https://doi.org/10.1007/s11269-016-1500-x

Article Title	A sub-catchment based approach for modelling nutrient dynamics and transport at a river basin scale
ERA Journal ID	30189
Article Category	Article
Authors	Alam, Md Jahangir (Author) and Dutta, Dushmanta (Author)
Journal Title	Water Resources Management
Journal Citation	30 (14), pp. 5455-5478
Number of Pages	24
Year	2016
Place of Publication	Netherlands
ISSN	0920-4741
	1573-1650
Digital Object Identifier (DOI)	https://doi.org/10.1007/s11269-016-1500-x
Web Address (URL)	http://link.springer.com/article/10.1007%2Fs11269-016-1500-x
Abstract	The prediction of nutrient pollution at realistic details is difficult due to lack of proper description of inherent processes in modelling tools. To overcome that this study has adopted a process based approach to build a semi-distributed model to simulate nutrient pollution in changing environment. The model was built to describe: (1) nutrient generation process in the catchment with consideration of different aspects of external and internal sources, (2) nutrient release from surface to the waterways via runoff and soil erosion, and (3) in-stream transport and chemical reaction process. The key novelty of this research is the linking of the nutrient generation process with transport mechanism for modelling nutrient dynamics at a basin scale. A flow capacity based approach was introduced to determine nutrient export from catchment to the waterways, which was useful to achieve the high resolution outputs from the model. The model performed reasonably well to represent the behaviour of nutrient in high flow events as well as in seasonal flow in two catchments located in distinct hydro-climatic regions. The study has shown that the nutrient model is suitable for predicting actual nutrient pollution in rivers for both high flow and seasonal flow under different hydro-climatic conditions. By simulating organic and inorganic nutrients separately,the model allows to estimate river water quality status in detail.
Keywords	nutrient pollution; process-based modelling; soil erosion; catchment and in-stream process; river basin
ANZSRC Field of Research 2020	401199. Environmental engineering not elsewhere classified
	370704. Surface water hydrology
	490303. Numerical solution of differential and integral equations
	370901. Geomorphology and earth surface processes
	400513. Water resources engineering
Public Notes	File reproduced in accordance with the copyright policy of the publisher/author.
Byline Affiliations	School of Civil Engineering and Surveying
	Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia
Institution of Origin	University of Southern Queensland

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