VTEI / restoration

restoration

Changes in spring areas following sudden major disturbances

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This article compares the condition of selected spring areas following sudden major disturbances with their previous condition, while also assessing long-term changes in drained and undrained spring areas. The impacts examined include major changes in groundwater abstraction for drinking-water supply, disturbances resulting from failures of drainage systems, and the effects of a large-scale forest fire. Three areas with contrasting hydrogeological characteristics were selected for the study. The results show that, while the abstraction of spring water for drinking-water supply has a fundamental effect on the very existence of springs, the large-scale forest fire did not significantly affect either the quality or quantity of groundwater. By contrast, gradual changes in agricultural management and the natural recovery of non-functioning drainage systems lead to the formation of secondary spring areas and a gradual improvement in the quality of the emerging water.

Assessment of fish passage in the Rolava river and estimated effects of its restoration on fish communities

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The study examines the effects of river network fragmentation on populations of rheophilic fish species in the Rolava and Ohře river basins, with particular emphasis on assessing fish passage and the effectiveness of restoration measures. An analysis of the river inventory indicates a high degree of anthropogenic disturbance in the Rolava; of the 41 transverse structures identified, more than half constitute critical barriers over 0.6 m high that most native fish species are unable to overcome.

Impact of Teplice restoration on river basin runoff – preliminary results

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As part of the project for the Ministry of the Environment of the Czech Republic dealing with the monitoring of the impact of nature­‑friendly measures on improving the hydrological regime of small river basins, the Teplice river basin in the White Carpathians has been observed. Monitoring has been taking place since 2018, the measures were implemented in 2020. Data are available for the time period before the measures were implemented and for the year 2021, on which it is possible to observe the impact of the implemented revitalization. The data show the fluctuation of the daily runoff from the river basin and its overall reduction, which is probably caused by increased evaporation from the newly formed water bodies and increased water infiltration into the underground zone. After evaluating the observed data, there was a visible reduction in the surface runoff from the basin, which may nevertheless also be caused by the low rainfall totals in 2021.