HR: 17:45h
AN: H34B-08    [Abstracts]
TI: Water Quality and Quantity Modeling for Hydrologic and Policy Decision Making
AU: Rubiano, J
EM: j.rubiano@cgiar.org
AF: Centro Internacional de Agricultura Tropical CIAT, Recta Cali-Palmira KM 17, Palmira, AA 6713 Colombia
AU: Giron, E
EM: condesan@cgiar.org
AF: Centro Internacional de Agricultura Tropical CIAT, Recta Cali-Palmira KM 17, Palmira, AA 6713 Colombia
AU: Quintero, M
EM: m.quintero@cgiar.org
AF: Centro Internacional de Agricultura Tropical CIAT, Recta Cali-Palmira KM 17, Palmira, AA 6713 Colombia
AU: * O'brien, R
EM: r.obrien@cgiar.org
AF: Centro Internacional de Agricultura Tropical CIAT, Recta Cali-Palmira KM 17, Palmira, AA 6713 Colombia
AB: This paper presents the results of a research project that elucidate the excesses of nitrogen and phosphorous using a spatial-temporal modeling approach. The project uses the approach of integrating biophysical and socio-economic knowledge to offer sound solution to multiple stakeholders within a watershed context. The aim is to promote rural development and solve environmental conflicts by focusing on the internalization of externalities derived from watershed management, triggering the transference of funding from urban to rural populations, making the city invest in environmental goods or services offered by rural environments. The integrated modeling is focused towards identifying causal relationships between land use and management on the one hand, and water quantity/quality and sedimentation downstream on the other. Estimation of the amount of contaminated sediments transported in the study area and its impact is also studied here. The soil runoff information within the study area is obtained considering the characteristics of erosion using a MUSLE model as a sub-model of SWAT model. Using regression analysis, mathematical relationships between rainfall and surface runoff and between land use or management practices and the measured nitrate and phosphate load are established. The methodology first integrates most of the key spatial information available for the site to facilitate envisioning different land use scenarios and their impacts upon water resources. Subsequently, selected alternatives scenarios regarding the identified externalities are analyzed using optimization models. Opportunities for and constraints to promoting co-operation among users are exposed with the aid of economic games in which more sustainable land use or management alternatives are suggested. Strategic alliances and collective action are promoted in order to implement those alternatives that are environmentally sound and economically feasible. Such options are supported by co-funding schemes designed with the private and public stakeholders having a role in the study area. The significance of this research is clearly depicted by the results of the different models applying here for the assessment of water quality parameters and for modeling upper catchments terrain surface change in the study area. Application of the methodology is presented for the Fuquene Lake Basin in Cundinamarca, Colombia. Additional research needs and limitations of the methodology are highlighted.
DE: 6309 Decision making under uncertainty
DE: 1803 Anthropogenic effects
DE: 1836 Hydrologic budget (1655)
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting