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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Extreme events, natural variability and climate change : Sedimentation and climate change on reservoirs in northern peru
Sedimentation and climate change on reservoirs in northern peru
Author : JUAN WALTER CABRERA CABRERA (1) & JULIO ISAAC MONTENEGRO GAMBINI (2)
ABSTRACT
Peru is a climatology complex country located in South America. Its Coast is characterized by flat surfaces, a semi arid
climate, and a few rivers which drain to Pacific Ocean. In northern Peru, the rivers are characterized by high flows
however, in the southern rivers have low flows; for this reason, an important number of irrigation projects have been
planned and developed in northern and the most important reservoirs are located over there.
The river dynamic produces sediment which will be deposited in the reservoir and will reduce its life. Poechos reservoir
represents the most critical case. This is the largest dam in Peru and it was designed to store 885 MCM of water but its
volume has been reduced to 418MMC due to heavy sedimentation processes to which it is exposed. Recent studies
suggest that could be completely silted by 2035, a process that could be accelerated if we consider the effects of global
warming.
In this article the potential effects of climate change on the storage capacity of reservoirs in northern Peru is discussed.
These reservoirs are part of important irrigation projects like Chira-Piura and Olmos-Tinajones Project.
First, an empirical correlation between monthly discharges and sediment volume is calibrated to every reservoir. After that,
the abc rainfall¨Crunoff model is calibrated to every basin. Then, the projected changes in precipitation and temperature are
used to generate projected series which are input to the calibrated R-R model to estimate projected discharges and new
sediment loads that will affect the life of the reservoir.
The analysis was performed using the projected changes by ECHAM 4, HadCM3 and NCAR DOE PCM models, which
have higher spatial resolution. The results show an important reduction in the life of the reservoir as a result of increased
volumes and the resulting increases in sedimentation and silting.
File Size : 230,590 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Extreme events, natural variability and climate change
Date Published : 18/08/2015
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