摘要：The capacity to interpret the observations regarding the environmental changes, to elaborate forecasts and to design efficient environmental strategies require a better perception on the structure and function of the various ecosystems and the interact ions between them. This paper presents the cumulative contribution of the land use and land cover in conjunction with the effluents originating from a wastewater treatment plant to the nitrogen and phosphorus loads of a section of the Ialomita River streamflow using the Soil and Water Assessment Tool (SWAT) model. SWAT estimates sediments and water quality variables such as total suspended solids, nitrogen species, phosphorus species, dissolved oxygen, organic load, pesticides, and various metal species. In this paper, the nitrates and phosphates were studied focusing on the individual contribution of wastewater discharges from an urban WWTP to the river loading. The model parameters were adapted using real measurements collected from the discharge point of the effluents originating from the urban Targoviste-South WWTP and from the downstream monitoring control section. The model was calibrated for flow, and subsequently for Nitrates and soluble P at the considered control section using 2007-2009 data. SWAT model, which has the capacity of detailed input information, produced accurate estimations concerning the nitrates and phosphorus loadings at a selected outlet. The results showed that the loading capacity of the Ialomita River was exceeded due to the amount of pollutants received in the water body. The final aim of research is to provide informational support to the decision-making processes regarding the improvement of the water quality in the Ialomita River watershed
