Preizkus metodologije določanja hidromorfoloških lastnosti rek na primeru Nadiže

Abstract

Prispevek predstavlja preizkus metodologije popisovanja hidromorfoloskih lastnosti, ki je sestavni del ocenjevanja ekoloskega stanja rek. Terensko kartiranje hidromorfoloskih elementov Nadiže je na podlagi upostevanja vecine kazalnikov pokazalo, da je na preucevanem odseku reka hidromorfolosko pretežno v naravnem stanju; indeks hidromorfoloske spremenjenosti je 0,09, indeks hidromorfoloske kakovosti pa 0,91, kar Nadižo na preucevanem odseku na podlagi hidromorfoloskih elementov uvrsca v razred zelo dobrega ekoloskega stanja. To povezujemo s hidrogeografskimi znacilnostmi zaledja oziroma povirje reke, kjer so vplivi cloveka majhni. Preizkus metodologije je pokazal, da morajo biti zaradi zagotavljanja ustrezne objektivnosti rezultatov popisovalci za terensko delo primerno usposobljeni. Pri terenskem ocenjevanju hidromorfoloskih lastnosti je za zagotavljanje vecje natancnosti smiselno uporabiti razlicne sodobne pripomocke za terensko kartiranje. //   The paper presents the results of an evaluated methodology for mapping rivers’ hydromorphological properties as a part of the methodology for evaluation of rivers’ ecological status. A field mapping of hydromorphological elements of the Nadiža River in a one kilometre long section showed very natural morphological status of the river in a view of the majority of the parameters; Hydromorphological Modification Index of the section is 0.09 and Hydromorphological Quality Index is 0.91 respectively, which classify the Nadiža in class “very good ecological status” according to the hydromorphological properties. This is a consequence of the hydrogeographical characteristics of the hinterland, representing the headwaters of the river, where human impacts are negligible. Methodologically, the evaluation of assessed methodology showed that the professionals conducting the field mapping should be properly experienced in order to assure sufficient objectivity of the results. At field assessing of different river morphological properties, the usage of various gadgets for field mapping is recommended.