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The floods of 1997 and Poland’s actions to join the EU put our rivers in the focus of attention of the European public. The exceptional specificity of Polish rivers versus other European rivers is obvious. We have scarce water resources which are highly polluted, and the rivers are only slightly regulated by hydrological structures. This limited intervention is an exceptional worth. For example, the Vistula River is the last European river to be regulated to such a small extent. The Vistula has a great economical and natural value. Unfortunately, a strong economic pressures due to current economic transformation poses a threat to Poland’s river systems. Hence, developing a nation-wide evaluation system of surface water resources and management plan, tailored to the EU requirements, is a necessity.
MesoHABSIM is a method for assessing and simulating changes in riparian fish habitats that describes the dependence between aquatic fauna and the abiotic environment. It permits identifying hydromorphological variability along entire streams in a manner that is applicable to tasks that have a high degree of generalization such as assessing the ecological status of entire catchment basins. It is an important tool for planning stream restoration and for conserving riparian ecosystems from anthropogenic impacts stemming from hydroelectric power facilities, water uptakes, and the like. This method quantifies the surface of aquatic fauna habitats, which is used in the model as a measurment value in river basin management scenarios. The MesoHABSIM system was developed and tested in 2000-2010 in the USA at Cornell University, the University of Massachusetts, and at the Rushing Rivers Institute. To date, the MesoHABSIM model has been used for 26 rivers in five countries. During testing, the model was improved and adapted to the specifics of these rivers. Simultaneously, the first and second versions of support software, SimStream, and a variety of tools for interpreting and presenting results were developed. This paper also presents initial results of studies performed in Poland by IFI on a segment of the Wisłoka River.
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