HR: 1400h
AN: H33A-07    [Abstracts]
TI: Assessing Runoff and Suspended Sediment Using SWAT Under Different Land Uses in Tapalpa, Jalisco, Mexico
AU: * BENAVIDES-SOLORIO, J
EM: benavides.juandedios@inifap.gob.mx
AF: INIFAP, PARQUE LOS COLOMOS S/N COLONIA PROVIDENCIA, GUADALAJARA, JAL 44660, Mexico
AU: FLORES-GARNICA, J G
EM: flores.german@inifap.gob.mx
AF: INIFAP, PARQUE LOS COLOMOS S/N COLONIA PROVIDENCIA, GUADALAJARA, JAL 44660, Mexico
AU: MORENO-GONZALEZ, D A
EM: moreno.davidarturo@inifap.gob.mx
AF: INIFAP, PARQUE LOS COLOMOS S/N COLONIA PROVIDENCIA, GUADALAJARA, JAL 44660, Mexico
AB: Runoff and erosion from different land uses within a watershed is one of the biggest concerns in Mexico. Different land uses affect the overall watershed, which may be observed by the amount and duration of runoff, erosion, pollution, and water quality. To understand the complex combination of land uses and analyze the results in hydrologic approach, different models may be used. One of them is the SWAT (Soil and Water Assessment Tool) model. For the purpose to understand the hydrologic cycle and the sediment yields over the entire Tapalpa watershed the SWAT model was used in this study. The Tapalpa watershed had different land uses such as pine forest, oak forest, shrubs, grass, agriculture and urban areas. The entire watershed is 21,000 ha and was subdivided into five subwatersheds, each one had different land use distribution. In one subwatershed the SWAT model was calibrated using two years of recorded runoff and precipitation data. The subwatershed El Carrizal had good results for the SWAT calibration, water yield had a high R² of 0.85. The average rainfall from the subwatershed had 913 mm. During the first year, the runoff had a value of 90 mm or 9% of the rainfall, and the second year was 20 mm or 3% of the rainfall. Most of the runoff from this subwatershed came as subsurface flow; other subwatersheds with larger agricultural areas produce more surface runoff and more sediment. The suspended sediment were low for El Carrizal, the values were 0.23 t ha^-1 yr^-1 and 0.05 t ha^-1 yr^-1 for the first and second year respectively but other subwatersheds had high values up to 17 t ha^-1 yr^-1 of suspended sediment. Inside forested subwatersheds roads and grazing are the main source of sediment and need more understanding about the magnitude of the effects. Roads, agriculture lands and grazing areas need to be studied in detail to find better relationships among runoff, erosion, water quality and land use in order to suggest better management practices.
DE: 1800 HYDROLOGY
DE: 1847 Modeling
DE: 1860 Streamflow
DE: 1879 Watershed
SC: Hydrology [H]
MN: 2007 Joint Assembly