Evaluation of the lisem model for the simulation of hydrosedimentologic processes in a small rural catchment on the basalt slopes of Rio Grande do Sul, Brazil / Avaliação do modelo LISEM na simulação dos processos hidrossedimentológicos de uma pequena bacia rural localizada nas encostas basálticas do Rio Grande do Sul

AUTOR(ES)

Michele Moro

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

2011

RESUMO

The intensive cultivation of the areas of southern Brazil that have poor agricultural potential (shallow soils on steep, basaltic hillsides) has contributed to the degradation of the environment by increasing rates of soil erosion and sediment yields. In this study, traditional monitoring methods have been combined with concurrent mathematical modeling to verify the effectiveness of the implementation of soil and water conservation practices on soil and water quality. This study seeks to evaluate the ability of LISEM (LImburg Soil Erosion Model) to spatially represent hydrosedimentological processes in a small rural catchment under tobacco cultivation. It also quantifies the effect of the combined practices in controlling sediment yield. The model was initially calibrated based on 10 rainfall events. The initial parameters used in the model were obtained, for the most part, from measurements reported in the literature. Observed hydrographs and sedigraphs for the outlet of the catchment were used to evaluate the model¿s ability to simulate hydrosedimentologic processes. The spatial erosive processes simulated by LISEM were evaluated using both as sediment fingerprinting and a field survey. Six LISEM model scenarios were developed to evaluate the implemented sediment control practices. These included traditional versus minimum tillage, the implementation of buffer strips and riparian vegetation to protect the stream. The LISEM model was capable of adequately reproducing the hydrograph for the 10 calibration events. On the other hand, suspended sediment concentration and sediment yield were almost always overestimated by the model when compared to the measured values. In general, the model appropriately simulated observed patterns of erosion and deposition for the more intense rainfall events. The importance of buffer strips and riparian vegetation in controlling sediment yield was confirmed by the simulation modeling.

ASSUNTO(S)

erosao : controle producao de sedimentos modelos matemáticos fumo conservação do solo bacia rural pequena bacia

Documentos Relacionados

• Aplicabilidade do modelo swat na simulação hidrossedimentológica em uma pequena bacia hidrográfica rural
• Análise de sensibilidade dos parâmetros do modelo SWAT e simulação dos processos hidrossedimentológicos em uma bacia no agreste nordestino
• Study of the winds in Rio Grande do Sul and simulation for an extratropical cyclone using MM5 Model
• Diatomáceas epilíticas indicadoras da qualidade de água na bacia do Rio Gravataí, Rio Grande do Sul, Brasil.
• A comunidade de macroinvertebrados bentônicos da bacia hidrográfica do rio dos Sinos, Rio Grande do Sul, Brasil