#### Pregled bibliografske jedinice broj: 70619

## Monthly and annual effective infiltration coefficients in Dinaric karst : example of the Gradole karst spring catchment

Monthly and annual effective infiltration coefficients in Dinaric karst : example of the Gradole karst spring catchment

*// Hydrological sciences : journal des sciences hydrologiques,*

**46**(2001), 2; 287-299 (međunarodna recenzija, članak, znanstveni)

**Naslov**

Monthly and annual effective infiltration coefficients in Dinaric karst : example of the Gradole karst spring catchment

**Autori**

Bonacci, Ognjen

**Izvornik**

Hydrological sciences : journal des sciences hydrologiques (0262-6667) **46**
(2001), 2;
287-299

**Vrsta, podvrsta i kategorija rada**

Radovi u časopisima, članak, znanstveni

**Ključne riječi**

Effective infiltration coeffocoent; karst hydrology; master depletion curve; Gradole karst spring (Istria-Croatia)

**Sažetak**

Abstract The purpose of the paper is to point to the problems and present methods for the calculation of monthly and annual effective infiltration coefficients in Dinaric karst catchments which cover areas smaller than 200 km2. An example of the catchment of the Gradole karst spring, which covers 114 km2, is given. The climate on the catchment is North Mediterranean. The average annual rainfall on the catchment is 986 mm, average air temperature of the catchment is 11.4 °C, while the average discharge from the Gradole Spring is 1.98 m3s-1. All the data refer to a period 1987-1998. The paper gives an auto-correlation analysis of daily and monthly discharges from the spring and monthly rainfall on the catchment. Special attention has been given to determination of monthly effective infiltration coefficients. It was found that the time scale effect makes it infeasible to use the expression by definition (1), because it gives values greater than 1 in 25% cases, which is theoretically impossible. Therefore, two different procedures for calculation of monthly effective infiltration coefficients are given, out of which one uses master depletion curve. This procedure gives acceptable and physically well-established values of mean long-term monthly effective infiltration coefficients. Obtained values can be used for regional analyses as well as for water resources management in karst regions. There was also a strong relationship between mean monthly air temperatures of the catchment and mean monthly effective infiltration coefficients. It is pointed to the significant influence of rainfall distribution during the year on the values of the annual effective infiltration coefficients, which for the Gradole catchment ranges between 0.356 and 0.763 with the mean value of 0.57.

**Izvorni jezik**

Engleski

**Znanstvena područja**

Građevinarstvo

**POVEZANOST RADA**

**Projekt / tema**

083171

**Ustanove**

Fakultet građevinarstva, arhitekture i geodezije, Split

**Autor s matičnim brojem:**

Ognjen Bonacci, (4434)

#### Časopis indeksira:

- Current Contents Connect (CCC)
- Web of Science Core Collection (WoSCC)
- Science Citation Index Expanded (SCI-EXP)
- SCI-EXP, SSCI i/ili A&HCI
- Scopus