Impact of an inter‐basin water transfer and reservoir operation on a karst open streamflow hydrological regime: an example from the Dinaric karst (Croatia)     

Ognjen Bonacci  Ivo Andrić 《水文研究》2010,24(26):3852-3863

This paper describes the hydrological changes caused by inter‐basin water transfer and the reservoir development on the hydrological regimes of two rivers. The Sabljaki Reservoir in the Zagorska Mre?nica River and the Bukovik Reservoir in the upper Dobra River began operation in 1959. Both are part of the hydroelectric power plant (HEPP) Gojak, whose installed capacity is 50 m³/s. Their water volumes at the spillway altitudes of 320·10 and 320·15 m a. s. l. are 3·3 × 10⁶ and 0·24 × 10⁶ m³ respectively. Both the Dobra and Mre?nica Rivers are losing, sinking and underground karst rivers. A 9376‐m‐long tunnel provides water from the Sabljaki Reservoir to the HEPP Gojak, which was constructed in the Lower Dobra River. The Sabljaki Reservoir is located in the Pla?ki karst polje, while the Bukovik Reservoir is located in the neighbouring Ogulin karst polje. The consequences of the inter‐basin water transfer are strong and have caused abrupt changes in the hydrological regimes of the downstream sections of both rivers. At the same time, the construction and development of both the reservoirs have also caused hydrological changes to the upstream section of the Upper Dobra River. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

Use of Mosses as Biomonitors of Major,Minor and Trace Element Deposition Around the Largest Thermal Power Plant in Serbia          下载免费PDF全文

Mirjana Ćujić  Snežana Dragović  Marko Sabovljević  Latinka Slavković‐Beškoski  Milan Kilibarda  Jelena Savović  Antonije Onjia 《洁净——土壤、空气、水》2014,42(1):5-11

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Height transformation models from ellipsoidal into the normal orthometric height system for the territory of the City of Zagreb     

Martina Gucek  Tomislav Bašić 《Studia Geophysica et Geodaetica》2009,53(1):17-38

The paper presents the testing of the possibility of determining the heights of GPS points in the homogeneous field in the new Croatian Height Reference System (HVRS71) by using the method of height transformation. The testing was made in the area of Zagreb. As part of the field works, normal orthometric heights of 27 GPS points were determined according to the new height system, by transferring the benchmark heights using the geometric levelling method, thus obtaining GPS/levelling points of known ellipsoidal and normal orthometric heights. The GPS/levelling points served as the basis for determining the transformation models that enabled the computation of normal orthometric heights from ellipsoidal heights of any GPS point in the observed area. The empirical data used for modelling were reduced undulation dN values of GPS/levelling points. As part of the dN modelling with parametric functions, the approximation surfaces were obtained on the basis of three polynomials: FN310, FN312 and FN318. The transformation models were also tested using non-parametric Watson and Loess algorithms. The FN318 and Loess models yielded the best results.  相似文献   

Azimuthal anisotropy of the Pg-wave velocity in hypocentral volumes of NW Croatia     

Marijan Herak  Davorka Herak  Josip Stipčević 《Acta Geophysica》2009,57(3):600-615

Based on a large set of arrival times of the Pg phase reported by local and regional stations, we estimate azimuthal anisotropy of the Pg-wave velocity in focal volumes of the upper crust in NW Croatia. The method is based on analyses of the azimuthal dependence of ratios of cumulative differences of arrival times and travel paths between foci of earthquake pairs, computed for rays propagating within narrow azimuthal windows. The results clearly indicate the presence of anisotropy of 3.3% with the direction of fast velocity (approximately NNE-SSW) coinciding with the direction of the maximum tectonic pressure as revealed by 23 available focal mechanisms and previous geological investigations. Although a large part of observed anisotropy can be explained assuming that focal volumes are pervaded by a system of vertical extensive-dilatancy anisotropy (EDA) cracks aligned under the influence of local tectonic stress field, there is indication that — to a smaller extent — some role was also played by alignment of structural features in the region.  相似文献   

A parallel mesh-free contaminant transport model based on the Analytic Element and Streamline Methods     

Karl W. Bandilla  Alan J. RabideauIgor Janković 《Advances in water resources》2009

This paper introduces a new method for simulating large-scale subsurface contaminant transport that combines an Analytic Element Method (AEM) groundwater flow solution with a split-operator Streamline Method for modeling reactive transport. The key feature of the method is the manner in which the vertically integrated AEM flow solution is used to construct three-dimensional particle tracks that define the geometry of the Streamline Method. The inherently parallel nature of the algorithm supports the development of reactive transport models for spatial domains much larger than current grid-based methods. The applicability of the new approach is verified for cases with negligible transverse dispersion through comparisons to analytic solutions and existing numerical solutions, and parallel performance is demonstrated through a realistic test problem based on the regional-scale transport of agricultural contaminants from spatially distributed sources.  相似文献   

Short-term Tests of Potassium dIdD Vector Magnetometer     

Eugen Vujić 《Acta Geophysica》2015,63(5):1276-1295

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Determination of Emerging Substances in the Danube and Potential Risk Evaluation          下载免费PDF全文

Nevena N. Grujić Letić  Maja Lj. Milanović  Nataša B. Milić  Mirjana B.Vojinović Miloradov  Jelena R. Radonić  Ivana J. Mihajlović  Maja M. Turk Sekulić 《洁净——土壤、空气、水》2015,43(5):731-738

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Informing and public awareness on waste separation: a case study of the City of Niš (Serbia)     

V. Miltojević  I. Ilić Krstić  A. Petković 《International Journal of Environmental Science and Technology》2017,14(9):1853-1864

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Forecasting hourly particulate matter concentrations based on the advanced multivariate methods     

M. Perišić  D. Maletić  S. S. Stojić  S. Rajšić  A. Stojić 《International Journal of Environmental Science and Technology》2017,14(5):1047-1054

In this study, several multivariate methods were used for forecasting hourly PM₁₀ concentrations at four locations based on SO₂ and meteorological data from the previous period. According to the results, boosted decision trees and multi-layer perceptrons yielded the best predictions. The forecasting performances were similar for all examined locations, despite the additional PM₁₀ spatio-temporal analysis showed that the sites were affected by different emission sources, topographic and microclimatic conditions. The best prediction of PM₁₀ concentrations was obtained for industrial sites, probably due to the simplicity and regularity of dominant pollutant emissions on a daily basis. Conversely, somewhat weaker forecast accuracy was achieved at urban canyon avenue, which can be attributed to the specific urban morphology and most diverse emission sources. In conclusion to this, the integration of advanced multivariate methods in air quality forecasting systems could enhance accuracy and provide the basis for efficient decision-making in environmental regulatory management.  相似文献   

A kinematic model of vertical geomagnetic field variation resulting from a steady convective flow     

Alexandra Marsenić 《地球物理与天体物理流体动力学》2014,108(2):191-212

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