Utjecaj repelentnosti tla opožarenih područja na infiltraciju i tok vode

master's thesis

• Title (english): Inpact of soil water repellency on water flow and infiltration in fire affected area
• Author: Mirel Mešić
• Mentor: Vilim Filipović (mentor)
• Committee member: Vilim Filipović (predsjednik povjerenstva)
• Committee member: Ivan Mustać (član povjerenstva)
• Committee member: Vedran Rubinić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Soil Amelioration); Zagreb
• Defense date and country: 2018-09-05, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

Nadolazeće klimatske promjene predviđaju izrazitije i duže pojave sušnih razdoblja s povećanjem rizika od požara u Hrvatskoj i značajnom redistribucijom godišnjih oborina. Kao posljedica se očekuje povećanje repelentnosti tla za vodu (RTV). Cilj rada je utvrditi utjecaj požara na hidrauličke karakteristike tla, moguću pojavu hidrofobnosti tla i njezin utjecaj na infiltraciju i tok vode u nesaturiranoj zoni tla. Infiltracijski pokusi s vodom i etanolom na jako opožarenom (A), opožarenom (B) i kontrolnom (C) tlu korišteni su kao osnova za inverzno određivanje hidrauličkih parametara potrebnih za kalibraciju računalnog modela (HYDRUS 2D/3D). Jednogodišnji klimatski scenarij uz primjenu stvarnih meteoroloških podataka je nakon toga simuliran pomoću softverskog programa HYDRUS-1D. Rezultati velikog smanjenja hidrauličke provodljivosti tla (Ks) u područjima A i B ukazuju na RTV. Jednogodišnja simulacija nije pokazala značajan utjecaj RTV na bilancu vode. S druge strane, simulacijom razdoblja intenzivnih oborina, rezultati ukazuju da RTV nastala uslijed dužih sušnih perioda i kratkih intenzivnih oborina povećava mogućnost pojave površinskog otjecanja i smanjenje infiltracijske sposobnosti tla.

Abstract (english)

Expected climate change predictions are suggesting that the occurrence of more pronounced and longer dry periods with an increased fire risk and significant redistribution of annual precipitation may be expected in Croatia. Consequently, an increase of soil water repellency (SWR) is expected. The aim of this thesis is to determine the impact of the fire on the hydraulic characteristics of the soil, the possible appearance of soil hydrophobicity and its influence on infiltration and water flow in the unsaturated soil (vadose) zone. Infiltration experiments with water and ethanol on highly affected (A), affected (B) and control (C) site (non-affected), were used as a basis for the inverse determination of hydraulic parameters required for calibration of a computer model (HYDRUS 2D/3D). The one-year climatic scenario with the application of real meteorological data is then simulated using the HYDRUS-1D software program. The results of a large reduction in soil hydraulic conductivity of the soil (Ks) in sites A and B indicate SWR. Seasonal (one year) simulation did not show a significant impact of SWR on the water balance. On the other hand, by simulating the period of intensive precipitation, the results indicated that SWR caused by longer dry periods and short intensive precipitation increases surface runoff and reduces the infiltration capacity of the soil.

• Keywords: repelentnost tla za vodu (RTV); tok vode; matematički modeli; HYDRUS; površinsko otjecanje
• Keywords (english): soil water repellency (SWR); mathematical models; water flow; HYDRUS; surface runoff
• Language: croatian
• URN:NBN: urn:nbn:hr:204:521652
• Study programme: Title: Agricultural Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/ magistra inženjer/inženjerka poljoprivredne tehnike (magistar/ magistra inženjer/inženjerka poljoprivredne tehnike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2018-09-26 11:54:01