During the pumping of wells, the groundwater level drawdown, as measured in the pumped well, is increased by non-linear losses caused by the water flow velocity through the well screens. This ...undermines the adequacy of the direct use of the measured drawdown data in the well for the purpose of the realistic identification of the effective well radius and aquifer parameters. This anomaly is avoided by reshaping the drawdown function into a function of the specific drawdown sw/Q of the pumped well. This reshaping simplifies the exclusion of non-linear losses from the sequence of measured data of the water level in the well at the position of the effective radius of the pumped well. Combining the data of linear losses and the respective pumping rate of the pumped well, a function of the specific drawdown of the radial flow sw/Q was formed. This function describes the aquifer parameter relations during the respective test pumping. A consistent sequence of the function of the specific drawdown sw/Q of the pumped well reveals the actual value of the coefficient of nonlinear losses. Moreover, the specific drawdown function enables the reliable estimation of aquifer transmissivity using only the pumped well drawdown data.
Soil plays an important role in the accumulation and transport of potentially toxic elements (PTEs), from surface into aquifer. PTEs can get to the environment naturally, but also from different ...kinds of contamination sources. In this study, a soil profile located in the vicinity of well field Petruševec, one of the most important well fields related to the public water supply of the City of Zagreb, was analyzed. The main aim of this study was to determine soil properties which can influence retention/mobilization of Ni and Cr in alluvial soil, as well as to define their origin in the investigated soil profile. Results suggest that Cr is geogenic, while Ni is probably of dominantly anthropogenic origin. Observed concentrations, enrichment factors and Igeo values showed no enrichment for Cr, while for Ni, they showed minor to very severe enrichment, i.e., that in some soil horizons, moderate to strong pollution exists. Evaluation of wind directions and location of possible contamination sources that prevail in the study area suggest that Ni can come by aerodeposition from different sources. Results showed that mineral composition can have important influence on retention of analyzed PTEs. Soil horizons, which have very high concentrations of Ni, in general have higher proportion of clay minerals, especially chlorites, as well as Fe oxyhydroxides which can act as an adsorption phase for the investigated PTEs. Results suggest that more detailed research about the investigated PTEs presents a necessity if measures for soil and groundwater protection want to be effectively implemented.
This paper establishes hydrogeological and hydrogeochemical characteristics of a wider area of the regional well field Eastern Slavonia - Sikirevci. The research was conducted based on data gathered ...from the area of the Federation of Bosnia and Herzegovina and the Republic of Croatia. The aquifer Velika Kopanica is situated at the territory of the Republic of Croatia in the triangular region formed between Kopanica, Gundinci and Krusevica. The River Sava partially flows through it and the aquifer extends beneath the river to the territory of the Federation of Bosnia and Herzegovina from Donji Svilaj in the West to Domaljevac in the East where its yield is the highest. The thickness of the aquifer decreases towards the water body Odzak. It was determined that the groundwater which is extracted from wells of the wider area of the regional well field contains iron, manganese, natural ammonia and arsenic in values exceeding the maximum allowable concentration for drinking water. The increased values of these parameters are a result of mineral composition and reductive conditions in the aquifer environment. By means of a multivariate statistic cluster analysis, an overview of groups of elements is provided based on geochemical affinity and/or origin.
Ovim radom utvrđena su hidrogeološka i hidrogeokemijska obilježja šireg područja regionalnog crpilišta „Istočna Slavonija“ Sikirevci. Istraživanja su provedena na temelju prikupljenih podataka sa ...područja Federacije Bosne i Hercegovine i Republike Hrvatske. Vodonosni horizont Velika Kopanica koji se na području Republike Hrvatske nalazi u trokutu između Kopanice, Gundinaca i Kruševice, djelomično je presječen Savom te se ispod Save proteže u Bosnu i Hercegovinu, tj. entitet Federaciju Bosne i Hercegovine, od Donjeg Svilaja na zapadu do Domaljevca na istoku gdje je njegova izdašnost najveća. Debljina vodonosnog sloja se smanjuje prema vodnom tijelu Odžak. Utvrđeno je da podzemna voda koja se crpi na zdencima šireg područja regionalnog crpilišta, sadrži željezo, mangan, prirodni amonijak i arsen u koncentracijama koje prelaze maksimalno dozvoljene koncentracije za pitku vodu. Povišene vrijednosti navedenih parametara su posljedica mineralnog sastava i reduktivnih uvjeta u vodonosnoj sredini. Multivarijatnom statističkom klaster analizom dobiven je prikaz skupina parametara kakvoće vode na temelju geokemijskog afiniteta i/ili porijekla.
U radu je prikazan hrvatski pristup za određivanje graničnih vrijednosti tvari i pokazatelja mogućih onečišćenja podzemne vode u vodnom području rijeke Dunav i jadranskom vodnom području. Detaljno su ...obrazloženi kriteriji za određivanje graničnih vrijednosti, prilagođeni značajkama hidrogeoloških sustava te s njima povezanih ili o njima ovisnih kopnenih i vodenih ekosustava u Republici Hrvatskoj, koji se odnose na referentne standarde kakvoće, odnosno kriterijske vrijednosti, te na pozadinske koncentracije. Analizirane su različite metode procjene pozadinskih koncentracija, koje su korištene u postupku određivanja graničnih vrijednosti u RH, te je razmotrena pouzdanost rezultata dobivenih primjenom različitih metoda na osnovi zajedničkih kriterija. Prikazan je postupak utvrđivanja kriterijskih vrijednosti za važne prijamnike i vidove korištenja podzemne vode, a posebno su analizirani i opisani glavni tipovi graničnih vrijednosti koji se koriste u postupku ocjene kemijskoga stanja ili procjene rizika u pojedinim vodnim područjima. Na primjeru grupiranoga tijela podzemne vode Istočna Slavonija – sliv Drave i Dunava prikazan je postupak određivanja pozadinskih koncentracija i graničnih vrijednosti za odabrane tvari i pokazatelje.
Služba za anesteziju, reanimaciju i intenzivno liječenje u zbrinjavanju ranjenika domovinskog rata maksimalno je iskoristila sve svoje ljudske i stručne potencijale. Od početka agresije na Republiku ...Hrvatsku zbrinula je do kraja srpnja 1992. godine 1.135 vitalno ugroženih bolesnika, a od toga 755 teških ranjenika s izrazito ugroženim vitalnim funkcijama, i to s područja Slavonskog Broda, Županje, Nove Gradiške, Đakova, Vinkovaca te cijele sjeverne Bosanske Posavine. U istom vremenskom razdoblju Služba je obavila 6918 anestezioloških zahvata.
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