Silting in the dense reservoir network of the Pereira de Miranda catchment

Abstract

-This study aims to analyze the impacts of the reservoir network within Pereira de Miranda -CE catchment (also called Pentecoste) over sediment transport and storage capacity of the system. The survey of the "damming" was carried out using satellite images. We identified 502 erosion units, derived from overlaying maps of the Universal Soil Loss Equation parameters, which allowed the estimation of localized erosion in the basin and identification of areas potentially generating sediment. In order to estimate silting in Pentecoste reservoir, different system structure scenarios were considered. An average erosion rate of 59 t ha -1 year -1 was estimated. According to the model, the silting of Pentecoste reservoir may vary from 1.1 to 2.6% per decade, depending on the scenario considered. It is also observed that the reservoirs upstream can retain up to 58% of the sediment that would reach the Pentecoste reservoir. Very small reservoirs with a capacity of up to 100,000 m³, although representing only 1.83% of the system water availability, are able to retain almost 8% of total sediment produced.

Simplified Method for the Assessment of Siltation in Semiarid Reservoirs Using Satellite Imagery

“…However, reservoirs can also be qualitatively affected by silting since they act as filters which retain a considerable portion of the sediment carried by rivers [9,10]. This retained portion, when deposited at high rates, can cause significant increases in nutrients and other water pollutants.…”

Spectral Response of Water Under Different Concentrations of Suspended Sediment: Measurement and Simplified Modeling

“…Still, qualitatively the reservoirs can be affected by silting since they act as filters able to retain a considerable portion of the sediment carried by rivers (Lima Neto, Wiegand, & de Araújo, 2011;Lira, Toledo, & Mamede, 2014). This retained portion, when at high deposition rates, can cause significant increases in nutrient and other water pollutants.…”

Performance of Analysis Methods of Slope Stability for Different Geotechnical Classes Soil on Earth Dams

“…Water is a resource widely used for human consumption and in industry, agriculture, power generation, transportation, leisure, assimilation, and the transportation of effluent (MEDEIROS et al, 2010), thus the use of surface freshwater resources and the need to store them during periods of reduced availability highlight the need to build dams in order to optimize water availability in each watershed (LIRA et al, 2014).…”