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 ID30189
Article CategoryArticle
AuthorsAlam, Md Jahangir (Author) and Dutta, Dushmanta (Author)
Journal TitleWater Resources Management
Journal Citation30 (14), pp. 5455-5478
Number of Pages24
Year2016
Place of PublicationNetherlands
ISSN0920-4741
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.

Keywordsnutrient pollution; process-based modelling; soil erosion; catchment and in-stream process; river basin
ANZSRC Field of Research 2020401199. 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

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Byline AffiliationsSchool of Civil Engineering and Surveying
Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia
Institution of OriginUniversity of Southern Queensland
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