Abstract
In this paper we calculate the trap efficiency of the reservoirs in the Siret Basin and we make also a briefly analysis to show the way this reservoirs influence the sediment discharge of the rivers by sedimentation. Trap efficiency (TE) is an indicator and parameter of sediment yield from upstream and of sedimentation rate from the reservoirs. In consequence we calculate for 14 reservoirs in the Siret Basin this parameter. The values of TE vary between 42 – 98% and correlates very well with the capacity of the reservoirs. In reservoirs with the high capacity the values approach to 100% while in small reservoirs, the value of TE is decreasing. Capacity and operating mode lakes are important factors controlling the degree of retention of sediment from the source area. Sedimentation within reservoirs is a problem as it decrease the storage capacity and, hence, makes the structure less efficient. For small reservoirs, sedimentation can become a severe problem as the rate of siltation is generally much higher in comparison to large dams
Highlights
Reservoir sedimentation is a serious consequence of soil erosion with large environmental and economical implications
The objective of this paper is to indicate how the reservoirs from the Siret Basin influence the sediment discharge of the rivers by sedimentation and to calculate the trap efficiency of the reservoirs from this basin which indicate the capacity of these reservoirs to trap sediments
Various authors have indicated this with reference to reservoir silting and river processes occurring downstream of dams, namely deepening riverbeds (Ichim and Rădoane, 1986), which is not subject of this study
Summary
Reservoir sedimentation is a serious consequence of soil erosion with large environmental and economical implications. For this paper we must make reference to sediment trap efficiency. The first has paid special attention to this parameter was Brown (1943) who developed a model It was followed by others who have contributed to the knowledge of trap efficiency - TE (Churchill, 1948; Brune, 1953; Vanoni, 1977; Heinemann, 1981) and some of them even made improvements to the model (Churchill, 1948; Brune, 1953; Heinemann, 1981). Verstraeten and Poesen (2000) made a synthesis of the most used methods for calculating TE both in terms of empirical models and theoretical models
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Schedule a callMore From: Scientific Annals of Stefan cel Mare University of Suceava. Geography Series
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