Hidrologia de uma bacia experimental em caatinga conservada no semi-árido brasileiro

Abstract

The overall objective was to quantify and assess the main hydrologic? Cal processes, including the production ?? the sediment, the Experimental Basin Aiuaba (BEA) for the per? Odo 2003-2007. BEA with? Area of ​​12 km2, are located in sert? Inhamus of the in? Preserve area ?? the Environmental savanna biome in this ?? the Ecol? gica (ESEC) of Aiuaba, Cear ?, belonging? Basin Alto Jaguaribe. Held featuring ?? the physiography, medi ?? the vari? Ble hydrologic? Ces, evaluates ?? the rain-deflators processes? Vio in hidrogr basin? Is and reservoir? River that controls it. In conclusion: the process percolates ?? the ude the BEA (capacity of 59,700 m3)? relevant and the same order of magnitude of the evaporated ??; the underground recharge? nea direct to the lake? Desprez? vel with regard ?? it? evaporates ?? e? infiltrates the ??; during the rain-deflators events? vio to evaporate the ??, ?? the infiltrates the underground and recharge? nea s? the Desprez? ble with regard to ?? the deflators? vio and affluent? precipitates ?? the direct on the lake. It follows from rain events saw-defl and the production ?? sediment which: runoff coefficient (CR) of the event? extremely low, and the mines l d ?? water drained smaller than l mines intercepted by the vegetation ???; ? N mere curve (CN) m dio per event was 42, with m ximo 59 and m nimo of 27?; manufac ?? the sediment showed values ​​between 9 and 291 kg / km2 for the 2006-2007 events, and m day of 97 kg / km2 per event; runoff? ? F number: time deflators vio was only 64% greater than the time of the precipitates ?? per event; the high losses in runoff occur, in part, for losses in three nsito in the main stream; l? drained mine in the secondary? river stream basin was eight times higher than in the basin of the main stream in 2007. It is inferred that the engine generates ?? the deflators? predominant surface vio? The Hortonian and, if relevant, contributes ?? the subsurface flow must occur to a depth less than 15 cm. The CR m? Dio annual BEA was 6.54% (m? Ximo of 31.08% and m? Nimo 0.13%). In 2004 the l? Drained mine in BEA was 35 times greater than the sum of l? Mines disposed in other years. Of 1543 days monitored in only 139 days it was seen outlets (9%), and 28 days of flow years n? O-rainy (1.8%). The production ?? the sediment in 2007 was five times higher than in 2006, and the bi? Nio 2006-07 om? S largest flow (April 2007) was respons? Vel for 71% of production ?? the sediments. Comparing the annual CR BEA with other basins in the river Jaguaribe, BEA was one that showed a lower coefficient of runoff. Formulated to hip? Thesis to be a BEA? Recharge area of ​​?? aq fractured fero that conditions hydrologic? Superficial cal processes.