Abstract
Objective: This research study analyzed hydrological surface behavior of the lower basin of the Cauca, San Jorge and Loba tributaries of the Magdalena River in the so-called La Mojana Region in northern Colombia. Methods/Analysis: To determine hydrological behavior of the basins under study, an analysis of vegetation cover was used as the most dynamic condition; its soil use and granulometry as the natural condition, regarding the hydrological pressure degree of the territory, as well as climatic behavior in the last 40 years in the area. Findings: Results show that cover and land use do not contribute favorably to basin hydrological regulation, considering that 45.9% have pasture cover, being this least favored hydrological regulation. Application/Improvements: 92.3% of the total study area (21,650.2 km2 ) shows curve numbers greater than 80, so that there is a high hydrological pressure on the territory. At the meantime, temperature shows a 0.8°C increase, while Evapotranspiration (ET) and vapor density have increases of 50.6 mm and 0.7 g m-1 respectively. Keywords: HSG, Hydrological Condition, Initial Abstraction
Highlights
Curve Number involves four fundamental aspects of land hydrological behavior in surface run off generation: 1. Hydrological soil group; 2
The cover and land use file was intersected with the GHS file, obtaining the curve number file; this Curve Number (CN) result was taken to AMCIII, given that for the study area, the accumulated background precipitation in five days is greater than 53 mm
The land cover and use file, obtained through SIGOT, was adjusted to the calculation hydrological conditions according to the calibration file in the use of the tool developed by[30] for the use of these in the curve number maps generation
Summary
Curve Number involves four fundamental aspects of land hydrological behavior in surface run off generation: 1. Hydrological soil group; 2. Curve Number involves four fundamental aspects of land hydrological behavior in surface run off generation: 1. Previous humidity[1,2]. CN is an empirical method developed by the Soil Conservation Service (SCS) of the United States, based on the abstraction of an event for which the relationships between precipitation and actual runoff with the potential are considered equal[3,4,5,6,7].
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