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WASUBI: A GIS tool for subbasin identification in topographically complex waterscapes
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
2005 (English)In: Environmental Modelling & Software, ISSN 1364-8152, Vol. 20, no 6, 729-736 p.Article in journal (Refereed) Published
Abstract [en]

Spatially distributed modelling is dependent on segmentation of the underlying geographic data and the model output could be improved if relevant compartments are found and used. Herein, we present a method for identifying subbasins in complex topographic waterscapes. The method first finds local troughs and then expands them over a friction surface derived from bathymetry. Friction surfaces generated by different cost growth functions were tested, and shown to give consistent results. The model is sensitive to the quality of the underlying topographic dataset and its spatial resolution. WASUBI (WAterscape SUBbasin Identification) is written in ArcView's built-in scripting language, Avenue, and distributed as a program extension. The method is easy to use, only requiring a digital elevation model (DEM) and the user to give the number of basins to be generated. The segmentation method was tested against datasets covering the Finnish Archipelago Sea and the Okavango Delta in Botswana. Test results showed that the WASUBI delineated subbasins were more enclosed than subbasins created by a semi-random delineation method. The objectives of this study was to construct and critically test algorithms for subbasin identification, based only on readily available DEM data, for use in geographic information system modelling.

Place, publisher, year, edition, pages
2005. Vol. 20, no 6, 729-736 p.
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-91542DOI: 10.1016/j.envsoft.2004.03.016OAI: oai:DiVA.org:uu-91542DiVA: diva2:164312
Available from: 2004-03-19 Created: 2004-03-19 Last updated: 2013-07-03Bibliographically approved
In thesis
1. Predictive Modelling of Aquatic Ecosystems at Different Scales using Mass Balances and GIS
Open this publication in new window or tab >>Predictive Modelling of Aquatic Ecosystems at Different Scales using Mass Balances and GIS
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents models applicable for aquatic ecosystems. Geographical Information Systems (GIS) form an important part of the thesis. The dynamic mass balance models focus on nutrient fluxes, biotic/abiotic interactions and operate on different temporal and spatial scales (site, local, regional and international). The relevance and role of scale in mass balance modelling is a focal point of the thesis.

A mesocosm experiment was used to construct a model to estimate the nutrient load of phosphorus and nitrogen from net cage fish farming (i.e., the site scale). The model was used to estimate what feeding conditions that are required for a sustainable aquaculture scenario, i.e., a zero nutrient load situation (a linkage between the site scale and the regional scale).

A dynamic model was constructed for suspended particulate matter (SPM) and sedimentation in coastal areas (i.e., the local scale) with different morphometric characteristics and distances to the Sea. The results demonstrate that the conditions in the Sea (the regional and international scale) are of fundamental importance, also for the most enclosed coastal areas.

A foodweb model for lakes was transformed and recalibrated for Baltic Sea conditions (i.e., the international scale). The model also includes a mass balance model for phosphorus and accounts for key environmental factors that regulate the presuppositions for production and biomasses of key functional groups of organisms. The potential use of the new model for setting fish quotas of cod was examined.

For the intermittent (i.e., regional) scale, topographically complex areas can be difficult to define and model. Therefore, an attempt was made to construct a waterscape subbasin identification program (WASUBI). The method was tested for the Finnish Archipelago Sea and the Okavango Delta in Botswana. A comparison to results from a semi-random delineation method showed that more enclosed basins was created with the WASUBI method.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 65 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 957
Earth sciences, mass balance model, dynamic model, scales, marine fish farms, rainbow trout, nutrients, suspended particulate matter, phosphorus, nitrogen, GIS, basin delineation, regionalisation, coastal areas, aquatic foodweb, fishing quotas, Baltic Sea, Archipelago Sea, Okavango Delta, Geovetenskap
National Category
Earth and Related Environmental Sciences
urn:nbn:se:uu:diva-4143 (URN)91-554-5922-6 (ISBN)
Public defence
2004-04-26, Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 10:15
Available from: 2004-03-19 Created: 2004-03-19Bibliographically approved

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