Abstract

BELTRAN VARGAS, JULIO EDUARDO  and  RANGEL CHURIO, JESÚS ORLANDO. Modeling the Trophic State of Wetland Jaboque, Bogotá D. C., Colombia. Acta biol.Colomb. [online]. 2013, vol.18, n.1, pp.149-164. ISSN 0120-548X.

A dynamic simulation model to explain the behavior of the total phosphorus in water and its relationship to the trophy status of wetland Jaboque, Bogotá D. C., Colombia, in three sections with particular physical and chemical characteristics is presented. The model includes the inflow and outflow flows of water and total phosphorus contributions in each of the three sections of the wetland with morphometric and water physicochemical conditions very different. The dynamic modelling was based on differential equations; we used the computer program Stella 9.1^®. In the months with higher flow (rainy season), the phosphorus load decreases in the three sections of the wetland, while in the months with lower flow (dry season) increases. In section one (third highest) trophy state index was 45.09 mg/m³ and hydraulic retention time of 14 days/year in the second section (middle third) trophy state index was 35.89 mg/m³ and the THR was 34 days/year. In the third section (lower third) values were 5.19 mg/m³ and 40 days/year respectively. These values indicate that the first and second sections are able to eutrophic state and third to mesotrophic. Sensitivity analysis allowed estimating that with a load of 0.62 mg/m³ total phosphorus could be maintained mesotrophic conditions in the third section and for the first two sections should be reduced to 0.2 mg/m³ load to achieve a mesotrophic state.

Keywords : dynamic modelling; hydraulic retention time; wetlands; trophic state; Jaboque.

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