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Issue 16 (2) 2017 pp. 107-122

Tomasz Kałuża, Zbigniew Sroka, Joanna Lewandowska

Uniwersytet Przyrodniczy w Poznaniu

IMPACT OF DECREASING THE NORMAL DAMMING LEVEL OF THE JEZIORSKO RESERVOIR ON LOW FLOWS IN THE WARTA RIVER

Keywords: multi-functional reservoir, optimization model of retention management, numerical unsteady flow model
Abstract:

An analysis of the impact of increasing the flood retention of the Jeziorsko reservoir on the low flows in the Warta section below the reservoir has been presented in the paper. Increase in the flood retention approx. 20 million m3 was achieved by changing the normal damming level (NPP) with the elevation of 120.50 m a.s.l. to the elevation of 120.00 m a.s.l. Multi-functional Jeziorsko reservoir, which is not only an important part of flood protection system but also performs the functions of supplementation in periods of low and very low flows in the Warta river. Lowering the NPP reduced the volume dedicated to supply the Warta river below the dam leading undermining the ability of increasing the flows in a low flow periods. The analysis was performed using one-dimensional numerical model of unsteady flow for the section of the Warta from the Jeziorsko reservoir to Oborniki. Hydrographs of discharge from the the Jeziorsko reservoir were determined using a numerical optimization model. The obtained results showed a significant effect of the reduction of NPP on the low flows in the Warta section below the reservoir. Both the number of days with outflow rate equal to reserved flow and number of days with flow lower than medium low flow (SNQ) were increased.

pub/16_2_107.pdf Full text available in in Adobe Acrobat format:
http://www.formatiocircumiectus.actapol.net/volume16/issue2/16_2_107.pdf

DOI: 10.15576/ASP.FC/2017.16.2.107

For citation:

MLA Kałuża, Tomasz, et al. "IMPACT OF DECREASING THE NORMAL DAMMING LEVEL OF THE JEZIORSKO RESERVOIR ON LOW FLOWS IN THE WARTA RIVER." Acta Sci.Pol. Form. Cir. 16.2 (2017): 107-122. http://dx.doi.org/10.15576/ASP.FC/2017.16.2.107
APA (2017). . Acta Sci.Pol. Form. Cir. 16 (2), 107-122 http://dx.doi.org/10.15576/ASP.FC/2017.16.2.107
ISO 690 KAłUżA, Tomasz, SROKA, Zbigniew, LEWANDOWSKA, Joanna. IMPACT OF DECREASING THE NORMAL DAMMING LEVEL OF THE JEZIORSKO RESERVOIR ON LOW FLOWS IN THE WARTA RIVER. Acta Sci.Pol. Form. Cir., 2017, 16.2: 107-122. http://dx.doi.org/10.15576/ASP.FC/2017.16.2.107
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Streszczenie w języku polskim:
http://www.formatiocircumiectus.actapol.net/tom16/zeszyt2/abstrakt-107.html