What is it about?
The Lima alluvial fan forms the basis of the Peruvian capital city, a nerve centre of a developing country, with a population of more than 10 million inhabitants. Due to its urban growth with poor planning and inadequate infrastructure, part of the population is exposed to frequent natural hazards such as floods and debris-flows. The landform is complex and is formed from the sediment contributions of the Rimac River and the coalescence of the alluvial fans of its tributaries. The upper sedimentary sequence of the fan, dominant on the Costa Verde, is Pleistocene-Holocene in age and was deposited about 110,000 years ago. The methodology used to study and define the recurrence periods of the large floods, which have generated the current soil of Lima, is geomorphology and field-based hydraulic techniques. Numerical modelling of hyper-concentrated flows simulating the contour conditions as deduced in the Rímac River have been used to extrapolate the simulation of future exceptional ENSO events.
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Why is it important?
This Doctoral thesis is the first research focused on the geomorphological evolution of the alluvial fan of Lima, located on the central coast of Peru.
Perspectives
The research means a better understanding of the geomorphological evolution of the Lima area. It has contributed to localize of high-risk areas for flooeds and debris flows, to the prevention of disasters in the Peruvian capital.
Dr Sandra Paula Villacorta Chambi
University of Western Australia
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This page is a summary of: Evolución geomorfológica del abanico aluvial de Lima y sus relaciones con la peligrosidad por inundaciones, Universidad Politecnica de Madrid - University Library,
DOI: 10.20868/upm.thesis.53442.
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