Abstract
Current paper's main contribution includes hydrodynamic modeling and morphological analysis of lake Bolonha which, along with lake Agua Preta, makes up the Utinga watershed in Belem, Para State, Brazil. Bathymetry of lake Bolonha was undertaken by digitalizing the data provided by COSANPA (the local Sanitation and Water Supply Company) dating back to 1983, and from a 2007 field study. Both bathymetries produced two terrain elevation models which were used for morphological analysis and hydrodynamic simulations. The morphological analysis showed that between 1983 and 2007, no significant relief changes occurred on the bottom of lake Bolonha, except for the formation of the outflow channels between the interconnecting channel and Bolonha Water Treatment Plant (WTP). The hydrodynamic model was able to simulate depths and velocities. The velocities, ranging between 1.8 and 9.0 cm s -1 , showed a subtle current between the outlet of the canal connecting the lakes Bolonha and Agua Preta and the water intakes of the Bolonha and Sao Braz WTPs. This fact demonstrated that lake Bolonha reservoir is a passage for waters from lake Agua Preta.
Highlights
Water is one of the vital basic inputs for the existence of mankind
Terrain Elevation Model (TEM) coupled to the roughness model and boundary conditions provided the date for the Saint-Venant equations that were solved and provided the simulation of velocities and depths of lake Bolonha
By comparing the raw TEMs (Figure 4) to the interpolated ones (Figure 7), it may be seen that the interpolated TEMs adequately represent the topography of lake Bolonha, which is very important for the success of hydrodynamic simulations
Summary
Water is one of the vital basic inputs for the existence of mankind. It is a renewable, yet not inexhaustible natural resource of public domain. Water has to be allocated for different purposes and, in that case, water integrity may be endangered by factors such as industrial development, accelerated urbanization and population growth. Water pollution in cities has been aggravated over the years due to an increase in the polluting loads from households and industries. These factors, such as increased sediment transports and organic and chemical contamination of waters, put at risk water resources
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