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The Diversification of River Habitat Survey Output During the Four Seasons: Case Studies of Three Lowland Rivers in Poland

Kiraga Marta

Journal of Ecological Engineering

2020

Vol. 21, nr 6

116--126

The EU Water Framework Directive demands maintaining or attaining good quality of the water bodies within the territory of the member states, which is strictly connected with the planning process of the water resources management. The water management plans have to include the assessment of the water body quality condition and further propose the actions to be implemented to enhance the quality of the European water resources. In order to answer the question of whether there is a risk of failure to achieve the WFD objectives, an assessment of the current status should be carried out, followed by an estimate on how likely achieving a good water status in the future is. One of the most popular valorization methods used for the water quality assessment is the River Habitat Survey (RHS) that enables the determination of two indicators, which summarize many single basic parameters, to assess the hydromorphological properties of rivers in a numerical form. Two indices are used most widely: Habitat Modification Score (HMS), which defines the range of transformations in river morphology and Habitat Quality Assessment (HQA), which is based on the presence and diversity of natural elements of the stream and river valley. The application of the above mentioned numerical indices allows calculating the hydromorphological quality status of the studied section following the expectations of the Water Framework Directive. Five ecological classes are distinguished. RHS is described as objective, suitable for statistical analyses, multidirectional and applicative method. However, the final valorization results are strongly affected by the presence of vegetation, which varies during the whole year. This contribution describes the analysis and comparison of the RHS results over the four seasons, namely: spring, summer, autumn and winter of three small lowland rivers in Poland (Zielawa, Zwoleńka and Zagożdżonka). It was unequivocally found that the value of the HQA parameter varied during the seasons, and the changes in its numerical value mainly depended on the condition, development level of vegetation, and the number of species observed. It was demonstrated that depending on the season, the Habitat Quality Assessment variation could change in about 5% of the maximal value, which could lead to a step from one hydromorphological class to another.

Wykorzystanie cech hydromorfologicznych do oceny stanu ekologicznego rzeki miejskiej

Zieliński P., Górniak A., Bralski M.

Inżynieria Ekologiczna

2012

Nr 29

246-256

Określono stan ekologiczny rzeki Białej (dopływ Supraśli) przepływającej przez aglomerację Białegostoku z wykorzystaniem metody River Habitat Survey (RHS). Badania przeprowadzono na 8 stanowiskach rozmieszczonych równomiernie wzdłuż biegu rzeki, zarówno na terenach podmiejskich jak i zurbanizowanych. W przeprowadzonych analizach wykorzystano parametry kształtu i budowy koryta, umocnienia brzegów, charakteru przepływu wody w korycie, zagospodarowania brzegów i doliny rzecznej. Wyliczono dwa główne wskaźniki stosowane w RHS tj. wskaźnik przekształcenia siedliska (Habitat Modification Score - HMS), oraz wskaźnik naturalności siedliska (Habitat Quality Assessment - HQA). Uzyskane wyniki HMS (średnia wartość 20,8) i HQA (średnia wartość 31,1) wskazują na znaczne przekształcenia doliny i koryta rzeki Białej co ma ogromny wpływ na funkcjonowanie tego typowo miejskiego ekosystemu lotycznego. Zgromadzone dane mogą posłużyć do przygotowania oraz podjęcia działań renaturyzacyjnych w dolinie rzeki na terenie miasta.

Ecological status of Biała river (tributary of Supraśl river) which flows through Białystok city (NE Poland) was assessed using River Habitat Survey (RHS) method. The survey was conducted on eight river sites located along the Biała river course. Our results indicated higher anthropogenic impact on the river habitat. Two main indices of the survey: Habitat Modification Score (HMS) and Habitat Quality Assessment (HQA) have values 20,8 and 31,1 respectively and are typical for moderately degraded rivers. The received results are important for future management plans and can be used in Biała restoration projects for the mostly urbanized parts of the river valley.