Prehajanje rib v ribji stezi na Ambroževem trgu

diplomska naloga

Natalija Rupreht (Avtor), Mitja Brilly (Mentor), Andrej Vidmar (Komentor)

Povzetek

Zadnje stoletje je sladkovodni ekosistem najbolj podvrţen človeškim posegom zaradi izkoriščanja vodne energije. Posledica posegov je, da so številne ribje vrste postale ogroţene in zaščitene z rdečimi seznami ali izginile. Zagotavljanje prehodnosti vodotokov je nujno za prehajanje rib, za ohranjanje ogroţenih in ostalih ribjih populacij. Ribe za svoje ţivljenje potrebujejo različne habitate za drst, rast, prehranjevanje, gibanje. Vsaka neprehodna ovira na vodotokih bi morala imeti urejen naraven, sonaraven ali tehnično grajen ribji prehod. Do izliva v reko Savo ima Ljubljanica kar nekaj neprehodnih ovir, zaradi katerih se je bistveno spremenila kvaliteta habitatov za ribe in tudi za ostale vodne organizme. V okviru projekta Ljubljanica povezuje – Obnovitev koridorja Ljubljanice in izboljšanje rečnega vodnega reţima je bila obnovljena ribja steza ob Plečnikovi zapornici na Ambroţevem trgu. Namen projekta je izboljšati in povezati habitate ciljnih ogroţenih vrst rib v Ljubljanici, to so sulec, platnica in blistavec, ki so zaščiteni z uredbami in pravilniki. V diplomski nalogi je predstavljena problematika prehajanja rib oziroma nefunkcionalnost ribje steze pred obnovo. Povzela sem obnovitvene ukrepe in izboljšave na stezi ter z meritvami pretoka in hitrosti vode na vtoku in v notranjosti ribje steze ugotavljali funkcionalnost le-te. Namen projekta Ljubljanica povezuje je tudi osveščanje ljudi o nujnosti vzpostavitve prehodnosti vodotokov za ribje populacije, tako iz spoštovanja do narave kot z vidika veljavne zakonodaje, ki narekuje obnovitev vseh obstoječih ribjih stez in gradnjo novih na območjih, kjer se bo posegalo v vodotoke.

Ključne besede

gradbeništvo;diplomska naloga;UNI;VKI;habitat;pregrade;ribji prehod;migracije;sulec;blistavec;platnica;pretok;hitrost vode;funkcionalnost ribje steze;

Podatki

Jezik:	Slovenski jezik
Leto izida:	2015
Tipologija:	2.11 - Diplomsko delo
Organizacija:	UL FGG - Fakulteta za gradbeništvo in geodezijo
Založnik:	[N. Rupreht]
UDK:	626.882(043.2)
COBISS:	7292001
Št. ogledov:	2635
Št. prenosov:	745
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	ǂThe ǂcrossing of fish through the fish ladder at Ambrož square
Sekundarni povzetek:	The freshwater ecosystem has mostly been susceptible to human interventions due to the exploitation of hydropower in the last century. The consequences of these interventions are increased numbers of endangered fish species and species categorized by the International Union for Conservation of Nature (IUCN) Red List as likely to become extinct or even extinct species. Ensuring the smooth transfer of watercourse is essential for fish to pass, for conservation of endangered as well as other fish populations. Fish need various habitats for living; for example, for spawning, growing, nourishment, movement. Where there is an impassable obstacle in the watercourse, there should be an organised natural or a technically built fish ladder. On the way to the Sava River estuary, there are a few impassable obstacles in the Ljubljanica River and because of that; the quality of habitats has changed fundamentally for fish and other water organisms. As a part of the project “Ljubljanica Connects – The Restoration of the Corridor of the Ljubljanica River and the Improvement of the River Regime”, the fish ladder next to the Plečnik sluice at Ambroţ square has been restored. The purpose of the project is to improve and connect the habitats of the endangered species in the Ljubljanica River; such as Danube Salmon (Hucho hucho), Danube Roach (Rutilus pigus), Striped Chub (Leuciscus souffia); that is species, protected by regulations. The thesis presents the problem of the migration of fish, or non-functionality of fish ladders before the renewal. Fish had not been able detect the passage. I summed up the renovation measures and the improvements in the fish ladder as well as established the functionality of the ladder with measuring the flow and the speed of the water flow at the entrance as well as in the middle of the fish ladder. The purpose of the project “Ljubljanica Connects” is also to raise awareness among people that the establishment of the smooth transfer of watercourse is essential for fish populations. It is vital we do this out of respect for nature and legislation that dictates the renewal of all the existing fish fishways and the construction of new areas where people will interfere with watercourses.
Sekundarne ključne besede:	graduation thesis;civil engineering;habitat;barriers;fish ladder;migration;endangered fish species;flow;the speed of the flow of water;the functionality of the fish ladder;
Vrsta datoteke:	application/pdf
Vrsta dela (COBISS):	Diplomsko delo
Komentar na gradivo:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Strani:	XII, 81 str.
ID:	9062287