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Investigating the mechanisms behind the hydroecological effects of small hydropower plants (SHPs) operation is urgently required since increasing growth in the hydropower sector has become a serious threat to river ecosystems. The aim of the present study was to investigate and assess the hydrobiological and-chemical risks of SHPs operation in Arme...
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Context 1
... results of the hydrochemical study showed that mineral nitrogen and salt pollution degree in the observation sites located downstream from all 3 SHPs operating on the Arpa river (Nos. 6, 8, 10) increased, which was probably conditioned by an elevated anthropogenic nitrogen and salt pollution level in the conditions of a decrease in the river velocity and discharge (Tables 3-5). The pollution was intensified due to lower dilution rate in the river observation sites located downstream from the SHPs. ...
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Citations
... Отрицательное влияние неуправляемой эксплуатации МГЭС в речных экосистемах Армении подтверждается также исследованиями изменений количественного и качественного состава фито-и зоопланктона в условиях отсутствия экологического стока в реках Варденис, Карчагбюр и Арпа [9]. Неправильные конструкции рыбопропускных сооружений блокируют миграцию рыб, препятствуя их естественному воспроизводству. ...
... As several papers were already published on analyses of abiotic parameters of the Arpa River (e.g. Hayrapetyan et al., 2016;Pirumyan & Simonyan, 2016;Gevorgyan et al., 2017), we have just followed the conclusions of the authors for assuming that candidate metrics for the Arpa River need to contribute to revealing organic pollution and hydro-morphological degradation as main stressor factors. One more approach to consider is the application of the metrics proven as relevant for the Alpine river types of EU countries, mostly southern intercalibration group (AQEM Consortium, 2002;Solheim et al., 2019). ...
The Government of the Republic of Armenia (RA) strives to ensure the measures to achieve good ecological status for Armenian surface water bodies. However, the main goal remains unaccomplished, as the hydro-biological monitoring tools are not properly developed. Thus, the current work aims at contributing to the establishment of principles and a relevant and cost-effective biological monitoring tool for the RA aquatic ecosystems, through the development of a simplified multimetric index (MMI). Since the adoption of the decree N° 927-N from 11 Jun 2011, the baseline studies have been initiated in the six river basin management areas established in the RA. The current work is summing up the results for the Arpa River system in order to test the methodology. In particular, it is testing the possibility to develop MMI based on the use of Rapid Biological Assessment protocol accepted in our monitoring system. Also, the work represents the approach of bottom-up biotic validation of reference sites established in the recent hydro-biologic monitoring system. Due to the proposed validation procedure, further use of one of the established reference sites in the case study object has been rejected. Considering well-established approaches for MMI development in EU member states, four variations of MMI were developed for a particular river system, and the combination of Ntaxa-%EPT-Abundance(ind/m²)-BMWP-ASPT-FBI-Nfamily metrics has been proposed as the main one. However, further development of a river typology and the establishment of joint reference conditions in the Caucasus region have concluded as a priority.
... Operation of small hydropower plants leads to non-compliance with environmental flows, partial draining of riverbed water in summer, overlapping migration routes for fish spawning and disruption of biodiversity indicators. There are many data on the impact of the operation of hydroelectric power stations mainly on fish and benthic communities, but phytoplankton is very sensitive to fluctuations in hydrological parameters and may also undergo significant changes due to the work of SHP [21,22]. From this point of view, the results obtained are very important and valuable. ...
A modern study of the Arpa River and its tributaries allows evaluating the ecological state of the ecosystem according to phytoplankton development indicators and comparing it with previous data. It is known that modified control of hydrosystems for hydropower stations changes quantitative and qualitative indicators of water, which increases anthropogenic impact on the diversity of hydrobionts. In order to mitigate the environmental risks and improve the ecosystem self-cleaning it is necessary to carry out continuous monitoring and rapid assessment of the change in the composition of microalgae indicators.
The authors designed a new site-adapted fish passage system for upstream and downstream migration of small and large fish on the urban sector of the Bistriţa River. The longitudinal connectivity of this lotic system is interrupted by numerous transversal hydrotechnical works (weirs). This proposed system was designed to facilitate fish migration, promote fish recolonization of upstream and downstream habitats, allow the expansion of fish range, and increase spawning potential. All components of the proposed system are attached to a concrete girder located to the right stream bank, except a glass basin that is submerged in the riverbed. The positioning of the system in this girder ensures its resistance to high water events, while offering safe passage for fish in both directions.
