Open AccessSpatial distribution of bottom sediment deposits in water reservoirs at Zesławice
Author(s) -
Bogusław Michalec,
Karol Pęczek,
Mateusz Strutyński
Publication year - 2009
Publication title -
annals of warsaw university of life sciences-sggw. land reclamation
Language(s) - English
Resource type - Journals
eISSN - 2081-9617
pISSN - 1898-8857
DOI - 10.2478/v10060-008-0049-7
Subject(s) - inflow , sediment , hydrology (agriculture) , siltation , geology , deposition (geology) , volume (thermodynamics) , spatial distribution , geomorphology , environmental science , geotechnical engineering , oceanography , physics , remote sensing , quantum mechanics
Spatial distribution of bottom sediment deposits in water reservoirs at Zesławice Spatial distributions of bottom sediment deposits in two small water reservoirs located on the River Dłubnia at Zesławice is presented in this paper. The distribution was elaborated according to Dendy's method on the basis of results of silting measurements performed in the 2005. Horizontal and vertical distribution of sediment deposits was shown as relation between the relative volume of deposited sediments (S h /S) and relative storage capacity of the reservoir (V h /V); the vertical distribution of sediment deposits was presented as relation between the relative volume of deposited sediments (S v /S) and relative reservoir depth (D/D m ). On the basis of performed analysis of horizontal distributions of sediment deposits it was stated that in the main reservoir at Zesławice 58% of the sediment trapped in the reservoir was accumulated in the inflow (upstream part of the reservoir, whose relative volume is 0.25). In the inflow section of the assistant reservoir of relative storage capacity equal 0.22 only 29% of the sediment was deposited. Comparing curves of horizontal sediment deposits distribution in the main reservoir in its inflow part according to measurement data from the 2005 and 1986 i.e. from a comparable period of operation before desilting and building of an assistant reservoir it was stated that relative volumes of sediment trapped after desilting are over 40% higher than before desilting. In a comparable period of operation before desilting (measurement in the 1983) and after desilting (measurements in the 2005) i.e. after seventeen and sixteen years respectively in the main reservoir the accumulated sediments formed an isle - the value S v /S equaling 0.09 for D/D m equal 0 in consequence of a change of hydraulic conditions of water and sediment flow - due to a part of inflowing water of the River Dłubnia being directed to the assistant reservoir.