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Universidade Federal de Pernambuco (UFPE) 2014

Modelos de evolução da dinâmica fluvial em ambiente semiárido – bacia do açude do saco, Serra Talhada, Pernambuco

Souza, Jonas Otaviano Praça de

Titre : Modelos de evolução da dinâmica fluvial em ambiente semiárido – bacia do açude do saco, Serra Talhada, Pernambuco

Auteur : Souza, Jonas Otaviano Praça de

Université de soutenance : Universidade Federal de Pernambuco (UFPE)

Grade : Doutorado em Geografia 2014

Résumé
Due the hydric deficit in Northeast drylands, it was developed a structure to hydric resource management based by pulses of water availability and surface water storage. However normally this management ignores the fluvial system dynamic, especially the behavior of the water and sediment, that characteristic will control the fluvial structure, the sediment storage and the surface water, deep and shallow, availability. The present work has as a goal to analyze the dryland fluvial dynamics to Saco Creek Watershed, Serra Talhada, Pernambuco, focusing the sediment conveyance by the landscape connectivity approach. At the end, the methodology will be applied to identify the response of behavior transmission due to natural and anthropogenic changes in the system, these responses may cause procedural and structural adjusts in the watershed. The local hydrologic behavior was detailed, as well the precipitation distribution by altimetric zone, and the detailed, using soils and land cover data, runoff behavior. To analyze the sediment transmission was used the landscape connectivity and the effective catchment area approaches, and to generate consistent future scenarios was worked with the landscape sensitivity and River Styles methodology. The Saco Creek watershed shows strong disconnectivity points that create virtually isolated areas to bedload sediment transport and your uplands shows the highest values to average runoff per square kilometer, due the high precipitation index and the natural vegetation removal. Regarding the change scenarios can stand out the vegetation degradation scenario that increase the runoff and fluvial incision, and the climatic change scenario that decrease the runoff and enhance the filling process. Lastly, the proposed methodology proved to be adequate to initial analyze about the transmission hydrosedimentological responses to processual and structural changes scenarios, natural and/or anthropogenic.

Mots Clés : fluvial geomorphology ; landscape connectivity ; landscape sensitivity ; transmission evolution model ; dryland.

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Page publiée le 30 juillet 2017