Analiza ponikava zaravni jugozapadne Istre

master's thesis

• Title (english): Analysis of Dolines on the Southwestern Istrian Planation Surface
• Author: Leonard Žnidarić
• Mentor: Sanja Faivre (mentor)
• Committee member: Sanja Faivre (predsjednik povjerenstva)
• Committee member: Mladen Pahernik (član povjerenstva)
• Committee member: Marin Mićunović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geography); Zagreb
• Defense date and country: 2023-09-19, Croatia
• Scientific / art field, discipline and subdiscipline: INTERDISCIPLINARY AREAS OF KNOWLEDGE; Geography

Abstract

Ponikve su analizirane na temelju digitalnog modela reljefa razlučivosti 5×5 m. Evidentirani su morfološki parametri ponikava te je provedena morfometrijska analiza poligona ponikava i analiza točkastog uzorka ponikava, primjenom GIS alata. Obodi ponikava su izdvojeni poluautomatskom metodom. Ukupno je ustanovljeno 34 476 ponikava na području istarskog poluotoka te 17 478 na području zaravni jugozapadne Istre. Analizom litostratigrafskih jedinica i morfometrijskih parametara reljefa određen je obuhvat zaravni. Na području zaravni većina ponikava je kružnog oblika, prosječne dubine 5,7 m. Gustoća ponikava iznosi 10,02 pon/km2, a indeks okršenosti 14,33. Najviše ponikava je razvijeno u donjokrednim vapnencima i dolomitima te rudistnim vapnencima. Područja najveće gustoće ponikava se nalaze na nadmorskim visinama iznad 200 m. Uspoređeni su digitalni modeli reljefa različite razlučivosti pri analizi gustoće ponikava i nagiba padina te gustoće i vertikalne raščlanjenosti reljefa. Analizirana je mjera disperzije na više razina. Uspoređeni su rezultati ručne digitalizacije i poluautomatske metode.

Abstract (english)

Dolines were analysed on the basis of a digital relief model with a resolution of 5×5 m. The morphological parameters of the dolines were recorded, and a morphometric analysis of the doline polygons and point pattern analysis of the dolines were performed using GIS. The edges of the dolines were extracted using a semi-automatic method. A total of 34 476 dolines were found in the area of the Istrian peninsula and 17 478 in the area of the Southwestern Istrian Planation Surface. Based on the analysis of lithostratigraphic units and morphometric parameters of the relief, the extent of the Planation Surface was determined. In the area of the Planation Surface, most of the dolines are circular and on average 5,7 m deep. The doline density is 10,02 dolines/km2, and the pitting index 14,33. Most of the dolines are formed in limestones and dolomites of the Lower Cretaceous and in rudist limestones. The areas with the highest doline density are located at altitudes above 200 m above sea level. Digital relief models of different resolutions were compared in the analysis of doline density and slope as well as in doline density and relative relief. The dispersion measure was analysed on several levels. The results of the manual digitisation and the semi-automatic method were compared.

• Keywords: ponikve; krš; zaravan; Istra; GIS; digitalni model reljefa; morfometrija
• Keywords (english): dolines; karst; planation surface; Istria; GIS; digital relief model; morphometry
• Language: croatian
• URN:NBN: urn:nbn:hr:217:899323
• Study programme: Title: Graduate study; specializations in: research; Course: research; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra geografije (sveučilišni/a magistar/magistra geografije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2025-09-19
• Created on: 2023-12-04 13:08:59