Zasnova prehoda za vodne organizme na Cajhnovem jezu na Savi

diplomska naloga

Maja Muzica (Avtor), Andrej Kryžanowski (Mentor), Jošt Sodnik (Komentor)

Povzetek

Vodni organizmi se tekom življenjskega cikla selijo vzdolž vodotoka zaradi zadovoljevanja raznovrstnih potreb. Glavni razlogi selitev so iskanje hrane, razmnoževanje, iskanje zatočišč pred plenilci ter ugodnejših pogojev za življenje. Prečni vodni objekti predstavljajo prepreke na migracijski poti, ki jih vodni organizmi brez ustrezno urejenih prehodov ne morejo prečkati. Iz tega razloga je pomembno, da so ribji prehodi projektirani v skladu s potrebami rib in vodnih nevretenčarjev, ki se na obravnavanem odseku gibljejo. Za prehod Cajhnovega jezu na Savi Bohinjki, tik nad sotočjem s Savo Dolinko, je bila v sedemdesetih letih zgrajena tehnična ribja steza z vertikalnimi režami, katera pa zaradi nepravilne zasnove ne omogoča prehoda vodnemu življu, poleg tega je še slabo vzdrževana (zaprojena v spodnjem delu, polna plavin). Ob nizkih vodostajih reke je onemogočena tudi migracija rib dolvodno, saj globina vode v podslapju ne zadošča za prehod. Namen diplomske naloge je bil seznaniti se z različnimi tipi ribjih prehodov, s ciljnimi vrstami rib na območju jezu, njihovimi plavalnimi sposobnostmi in nato poiskati najustreznejšo obliko ribjega prehoda. V nalogi smo zasnovali tri različne predloge možnih sonaravnih ureditev, ki obsegajo hrapavo klančino in hrapav kanal z balvani v rečni strugi ter obtočni kanal, ki je glede na značilnosti območja še najboljša rešitev.

Ključne besede

gradbeništvo;diplomska dela;vodarstvo;okoljsko inženirstvo;jezovi;ribje migracije;

Podatki

Jezik:	Slovenski jezik
Leto izida:	2016
Tipologija:	2.11 - Diplomsko delo
Organizacija:	UL FGG - Fakulteta za gradbeništvo in geodezijo
Založnik:	[M. Muzica]
UDK:	626.882:627.82(497.4)(043.2)
COBISS:	7750241
Št. ogledov:	1890
Št. prenosov:	669
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	Preliminary design of fish pass at the Cajhen weir on the Sava river
Sekundarni povzetek:	Throughout their life cycle, the aquatic organisms migrate along the river stream to fulfil their essential needs. Seeking for food, reproduction, seeking for shelter against predators and seeking for favorable living conditions are some of the main reasons for migrations. Transverse hydraulic structures in watercourses present a barrier for these organisms which cannot be passed without existence of appropriately designed and maintained fish passes. Therefore, these objects need to be designed and built according to the characteristics of fish and aquatic invertebrates living at the section of river in focus. To allow passing the Cajhen weir on the Sava Bohinjka river, just some hundred meters upstream of the confluence with the Sava Dolinka river, a technical fish pass with vertical slots was constructed in 70's. However, due to the inappropriate design it does not allow passing of the weir to any of aquatic organisms. It is also poorly maintained (backfilled with alluvium deposits in the bottom part, branches and timber logs stuck between the vertical slots). During the periods of low water in the watercourse, also migration down the stream is not possible due to the lack of water in the stilling basin in the spillway of weir. Goal of the presented thesis was to familiarize with the different types of fish passes, with target fish species at the area, their swimming characteristics and to define the most appropriate type of fish pass for the Cajhen weir. Three different solutions were analysed: fish ramp with boulders, bottom ramp and bypass channel. According to the characteristics of the area, the latter is considered to be the most appropriate solution.
Sekundarne ključne besede:	civil engineering;graduation thesis;fish migration;weir;fish ladder;
Vrsta datoteke:	application/pdf
Vrsta dela (COBISS):	Diplomsko delo
Komentar na gradivo:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Strani:	XI, 57 str., 3. pril
ID:	9224829