Year: 2020
Type: article
Abstract: A b s t r a c t. Hydraulic constructions have a significant impact on the surface water regime, and on the soil and groundwater conditions of the entire adjacent valley.Above the water barrages, surface water is being accumulated and the river changes its character to infiltrating.Below the barrages, there is deep erosion of the riverbed, the surface water level and the groundwater drainage base decrease, which results in the lowering of the groundwater level in the adjacent river valley.The examples of such phenomena are barrages on the Odra River downstream Wroc³aw.After the construction of barrages in Rêdzin, Brzeg Dolny and, recently, in Malczyce, a process of intensive deep erosion of the Odra riverbed is observed, currently along the section from Malczyce to Œcinawa.It ranges from 0.8 m in Œcinawa to 2 m in Malczyce.This results in a lowering of the groundwater level of the first aquifer on the discussed section of the Odra Valley.This phenomenon has a particularly negative impact on the £êgi Odrzañskie area conditions that are closely dependent on the groundwater level.The greatest damage occurs in oak-elm-ash riparian forests and concerns the oldest oaks.£êgi Odrzañskie is a valuable ecosystem with numerous protected species that have been legally protected under the Natura 2000 network and national forms of nature protection and protected landscape areas.The designed barrages in Lubi¹¿ and Œcinawa will stop the progressive deep erosion of the Odra riverbed.They will contribute to raising and stabilizing the groundwater level in the Odra Valley, which will partly return to a nearly natural level.
Source: Przegląd Geologiczny
DOI: 10.7306/2020.17
Authors: Grzegorz Firlit, Jacek Szczepiński
Language: Polish
Subfield: Water Science and Technology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W3023914263