Neven Kuspilić

• University of Zagreb

Rainfed agriculture is dependent on rainfall and runoff patterns, especially in lowland areas that rely on pumping operation to remove excess water from the drainage network. Polder areas are extremely vulnerable to saltwater intrusion and subsequent soil salinization driven by rising sea levels and accelerated by climate change. The aim of this pa...

This paper presents the concept of the project "Advanced monitoring of soil salinization risk in the Neretva Delta agroecosystem" (Delta Sal). Aim of the project is to develop and implement an advanced system for monitoring, forecasting and reporting the water and soil conditions in the Neretva Delta agroecosystem that is primarily used for agricul...

Opis pronosa nanosa u otvorenim vodotocima te mogućnost njegovog predviđanja predstavlja važan korak u boljem razumijevanju procesa koji je povezan s različitim klimatskim i antropogenim utjecajima te na posljetku i boljem upravljanju vodama na razini sliva. Dva najraširenija pristupa modeliranju pronosa nanosa u praksi su procesni modeli utemeljen...

SAŽETAK Ušće rijeke Drave u Dunav karakteriziraju specifični morfodinamički procesi znatne sedimentacije nanosa i posljedično problema vezanih uz osiguravanje gabarita plovnog puta. Analiza morfodinamičkih promjena zahtijeva dugoročno praćenje režima voda i nanosa kako bi se odredilo ravnotežno stanje u odnosu na referentne uvjete (nulto stanje utv...

Drava River confluence is characterized by specific morphodynamic processes under which significant sediment deposition is occurring at the Drava River mouth, impeding fairway conditions. Morphodynamic analysis requires long-term hydraulic and sediment transport regime data as input for estimation of equilibrium conditions, taking into account base...

U svrhu sveobuhvatnoga sagledavanja utjecaja morfodinamičkih promjena na stabilnost mostova na rijekama podatke o oštećenju konstrukcije mosta treba nadopuniti i podacima o djelovanjima na nju. U istraživanju analizirani su mehanizmi potencijalnoga gubitka stabilnosti mostova zbog hidrauličkih djelovanja te je dana ocjena stanja za mostove na želje...

The 32% of the most downstream Drava River section for low navigable water level of freeflow river does not meet minimal requirements for navigation due to the insufficient fairway depth. Aim of this paper is to estimate impact of proposed river training structures on long term morphologic development for 4 critical locations and evaluate the layou...

Adverse effect of local scour on bridge safety is well documented throughout the history, most notably in cases when scouring causes bridge collapse. Most straightforward way to assess scour hole depth is to employ one of readily available empirical equations, using flow field and riverbed characteristics as predictor variables. The aim of this pap...

The Drava and Danube confluence is characterized by specific morphodynamic processes resulting from the position of the river mouth on the inner, convex bank and the significantly higher Danube discharges than those of the Drava. On the Danube’s right bank, immediately upstream of the confluence, significant depositing of sediment has formed a sand...

Designing the entrance into a hydrotechnical intake channel presents a challenge with regard to the manner in which a desired hydraulic efficiency of the channel can be achieve when its spatial placement is generally limited by external factors and available space. A uniform velocity field distribution in the intake channel can be achieved by the e...

Local scour is phenomenon associated the most with bridge piers in sand-bed and gravel-bed rivers. Depth and extent of local scour hole reach their maximum during flood events as a response to extreme flow depth, velocity and shear stress, potentially posing a threat to the bridge stability. At the same time, extreme flow conditions resulting with...

Sažetak Neizravno djelovanje vodotoka predstavlja opasnost za sigurnost mostova jer uzrokuje podlokavanja dijelova konstrukcije, odnosno mijenja geometriju početnog projektnog stanja, i time ju stavlja u nove uvjete opterećenja. Periodičkim pregledom stanja korita i konstrukcije mosta u vodi se utvrđuje stvarno stanje mosta te pripadna ocjena, prep...

Climate change and with that connected more severe and frequent occurrence of urban flooding represent great challenge in urban water management. Flooding of urban areas results in consequences that may range from the short-time difficulties in functioning of the city to the most severe cases of infrastructure destruction, economic losses and human...

Dune formation in river systems influences sediment transport, flow characteristics, bank erosion, flood control, navigation and the protection of land and infrastructure. Research on dunes is mainly flume-based, and conclusions from such research are rarely, if at all, verified with field measurements. Dune formation and geometry in terms of heigh...

This study presents results from turbulent flow measurements conducted in a laboratory flume with a physical model of an arched bridge over a gravel bed stream. The aim of this research is to investigate flow conditions at the bridge abutment that initiated scour development in non-uniform gravel bed river.

Flood development in complex flow conditions where significant influence of backwater effect is present is not straightforward from the standpoint of flood generators and selection of the design flood flow. Design principles applied for levees within the flood risk management are frequently challenged. Research focus of this paper is Sava River rea...

Change of riverbed morphology under stresses imposed by flow on erodible boundaries can scour piers and abutments positioned in the riverbed, thus exposing their foundations to flow and rendering them susceptible to destabilisation. Therefore, scour is considered to be one of the most important hazards regarding bridge safety with catastrophic cons...

Estimation of flood hazard associated with return period of a hydrologic event is the basis for design of flood protection structures. More frequent occurrence of flood events in recent history has imposed the need to reconsider traditional hydrological approaches to estimation of high flow events. This paper focuses on estimation of peak flood dis...

Analiza zajedničke vjerojatnosti pojave velikih voda na ušćima primjenom bivarijatnih kopula Procjena opasnosti od poplava za hidrološki događaj zadanog povratnog razdoblja jest temelj projektiranja građevina namjenjenih sustavu obrane od poplava. Učestalo pojavljivanje velikih voda u kratkom razdoblju upozorava kako treba preispitati tradicionalne...

Riverbed topography is characterized by different bedforms, such as ripples, dunes, standing waves and antidunes. Geometrical properties of bedforms are dependent on hydraulic flow conditions and on characteristics of riverbed material. Occurrence of the bedforms can significantly influence the drag component of resistance to flow and therefore pre...

Estimation of high water discharges described by their reoccurrence frequency is important for many aspects of water management, most of all for flood protection. Implementation of flood protection measures relies on flood hazard assessment used in decision making which justifies the costs of such measures. A scientific approach called probabilisti...

Presence of scour at abutments significantly influences flow pattern in their vicinity, increasing turbulence and inducing vortexes in the flow field. Size of scour hole depends on flow parameters and is proportional to flow augmentation. Scour hole equilibrium depth is achieved under long-term exchange of high and low flows, but greatest scour hol...

Local scour at bridges is natural phenomenon that occurs when structure is placed in riverbed in a way that effects flow pattern. Riverbed can be protected from scour by implementation of scour countermeasures on riverbed section that is expected to be eroded. Scour countermeasures most commonly placed in the vicinity of bridge piers or abutments....

The paper presents an overview of the current state-of-the art and an approach to the study of dunes by analysing direct generators of physical processes in river beds. The approach is based on velocity measurements for mobile bed characterised by transport of bed load using the acoustic doppler current profiler (ADCP). The influence of mobile bed...

Safety of bridges over watercourses can be compromised by flow characteristics and bridge hydraulics. Scour process around bridge foundations can develop rapidly during low-recurrence interval floods when structural elements are exposed to increased flows. Variations in riverbed geometry, as a result of sediment removal and deposition processes, ca...

Najčešći uzrok oštećenja i rušenja mostova je djelovanje vode te je radi njihove prevencije nužno redovito promatranje promjena korita. Svjetska praksa obavljanja podvodnog pregleda mostova je različita, dok je naša regulativa u tome kontekstu manjkava-način pregleda, postupci i način ocjenjivanja stanja nigdje nisu definirani. Posljednjih godina o...

Dinamika podzemne vode u zagrebačkom aluviju Save usko je vezana s dinamikom promjena vodostaja u Savi. Produbljenje korita rijeke Save posljedično ima drenažni efekt aluvija kod malih voda te ga osiromašuje vodom. Posljedice erozije korita očituju se na remećenju prirodnog režima voda i nanosa i vremenom izmiču kontroli: razina srednjih, malih, ka...

Mnogi gradovi imaju problema s poplavama bujičnim vodama koje su posljedice pojava kiša velikih intenziteta. Ugrožavaju živote i zdravlje ljudi, a izravne i neizravne štete značajnog su reda veličine. Iako su velike, štete uglavnom ne premašuju vrijednosti za proglašenje elementarnih nepogoda, a naši ljudi nemaju naviku osiguravanja imovine protiv...

Ecological status, according to EU Water Framework Directive, is an expression of the quality of the structure and functioning of aquatic ecosystems associated with surface waters. It can be compromised by different forms of hydrological alterations. In this paper some aspects of fast and frequent fluctuations of discharge, most often caused by pro...

On Drava River's rkm 14+110 closure dam was constructed across the upstream end of the old bendway that is being preserved for Osijek port basin. During high water conditions when water level rises part of flow is diverted from main channel over closure dam. Overtopping of dam consequently disrupts water and sediment regime in port Osijek basin. Ai...

Na rkm 14+110 rijeke Drave izvedena je regulacijska pregrada " G " koja presi-jeca meandar starog riječnog korita cijelom širinom s ciljem stvaranja prostora za izgrad-nju bazenske luke Osijek u starom riječnom meandru. Pri protocima većim od srednje vode dolazi do prelijevanja preko pregrade, tj. u samoj luci se javlja poremećaj u režimu voda i na...

Irrelevant of origin, floods are natural phenomenon that cannot be prevented. Demographic and socioeconomic trends are playing a role in increasing society's exposure to flood-related damage, through factors such as urbanization of areas vulnerable to flooding. In order to understand natural disasters better it is necessary to intensify research ac...

Poplave predstavljaju prirodni fenomen koji nije moguće spriječiti bez obzira na uzrok njihove pojave. Povećana izloženost društva poplavama ima uzroke u demograf-skim i ekonomskim trendovima kao što je urbanizacija poplavnih područja. Produbljivan-je razumijevanja o prirodnim nepogodama podrazumijeva provođenje istraživanja i plana upravljanja riz...

The analysis and presentation of plan view parameters for 39 marinas operating in Croatia is made in the paper to enhance improvement of the spatial and economic planning of nautical tourism in Croatia. The following plan view parameters were collected: number of berths, number of dry berths, breakwater length, fixed pier length, pontoon length, wa...

For Indicators of Hydrological Alterations, nonparametric analysis of trend magnitude using Theil-Sen method and Mann-Kendall trend significance test has been performed in the Danube river basin in Croatia. Analysis have shown disturbing decreasing of May and June monthly flows resulting in extended low water season with possible negative impact on...

For Indicators of Hydrological Alterations, nonparametric analysis of trend magnitude using Theil-Sen method and Mann-Kendall trend significance test has been performed in the Danube river basin in Croatia. Analysis have shown disturbing decreasing of May and June monthly flows resulting in extended low water season with possible negative impact on...

Evident changes in weather patterns have had a great impact on the occurrence of extreme events. Alternating floods and droughts are becoming increasingly frequent in our areas. This year's catastrophic flooding in the lower reaches of the Sava River is an event that has so far never been recorded. Weather and hydrological circumstances under which...

There is noticeable negative impact on soil and water quality caused by nutrient leaching, especially nitrate. Five regions in Croatia are preliminary delineated as nitrate vulnerable zones, including potentially vulnerable zones (PVZ) and vulnerable zones (VZ), one of them being Varaždin County. Agricultural land spreads on 59% of its total area....

Svjedoci smo stalnih promjena geometrije korita prirodnih vodotoka, naročito produbljenja uglavnom uzrokovanih antropogenim djelovanjima. Razmjeri tih promjena koji puta prelaze očekivane veličine što stvara probleme na lokacijama izgrađenih mostova. Sigurnost određenih mostova ugrožena je zbog: (1) degradacije korita do razine dna temeljne stope i...

Continuous Wavelet Transform (CWT) is a powerful technique that enables analyzing periodic localization of hydrological time series. In this study CWT is used to analyze multi-scale variations in monthly discharge and suspended sediment load on 3 Gauging Station on the Sava River for the period from January 1979 to December 1993. The River Sava is...

Sandy riverbeds are covered by periodic bedforms of different scales, from ripples to antidunes. Under certain flow conditions simultaneously more than one type of bedforms can occur-smaller bedforms are superimposed on bigger ones. The superposition of bedforms causes difficulties for determining individual bedform parameters. In flume experiments...

We are evidencing continuous change in natural watercourses morphology, especially anthropogenic induced erosion. Rate of these changes sometimes exceeds maximum expected values which in turn causes problems on bridge sites. Existing bridges with piers on caisson foundations in riverbed which are presently fully functional as parts of transport inf...

Za smanjenje opasnosti od poplava bujičnim vodama često se kao tehnička mjera koriste retencije kao pojedinačne građevine ili u okviru sustava više građevina. Iznalaženje mjerodavnih oborina temeljem kojih se dimenzioniraju retencije složenije je što je složeniji sustav. Pri tome je jedan od ključnih elemenata korektno izrađen simulacijski model ko...

Spectral analysis and wavelet analysis of successive flood waves on the basis of measured water levels help to understand hydrological processes and to improve hydrological modeling. In this paper, we compare Fourier transform, short time Fourier transform and continuous wavelet transforms to describe behavior of River Sava. Urban, agricultural and...

Previous investigations showed that the application of boat-mounted acoustic Doppler current profilers (ADCP) is limited in rivers with substantial bed-load transport if boat velocities are calculated by the built-in bottom-tracking method. In order to overcome this limitation the speed and location of the boat is collected by an external RTK-GPS u...

On natural watercourses by the cities are more often than not conducted river training measures that resulted in stabilization of riverbanks. These measures are often conducted for navigation and resulted in straightening of river channel. The scale of the longitudinal morphological changes induced this way, additionally aided through anthropogenic...

U radu se prikazuje metodologija mjerenja morskih struja i vjetrovnih površinskih valova, te način obrade sirovih podataka i rezultati obrade za mjerenje ADCP strujomjerom s morskog dna. Morske struje i valovi mjereni su u priobalnom području kraj Šibenika ispred Zablaća na dubini od 15 m. Tijekom mjesec dana dobiveni su sirovi podaci o brzini mors...

Waterways that flow under bridge crossings are subject to changes in channel geometry on a regular basis. The scale of the changes can sometimes overwhelm estimated changes in the design process. The most usual concerns in relation to bridge design are; bearing capacity and the durability of the bridge construction and foundations, the optimum rout...

Vodotoci preko kojih se izvode mostovi su po svojoj prirodi podložni stalnim vremenskim promjenama svoje geometrije. Razmjeri tih promjena koji puta prelaze projektima predviđene veličine. Prilikom projektiranja mostova najčešće se posebna pažnja posvećuje nosivosti i trajnosti konstrukcije, temeljenju, zadovoljavanju uvjeta vođenja trase i drugih...

Introduction of ADCP devices resulted in great progress in hydrometry of open watercourses. Simple use and fast measuring allow collecting of a large number of data on channel geometry, distribution of velocities and the discharge. By conventional method of measuring in the watercourse, using the hydrometric wing, the point velocity is obtained by...

In the river engineering aspect, cut-offs pertain in river regulation actions that have significant effect on morphodynamical changes of the river channel. Shortening of the river course increases energy slope, which imply increase of shear stress on the river bed and disturbance of the river channel stability. To enable timely reaction in case of...

Croatia has signed in 1997 the European agreement on major international inland waterways (AGN) contract, which took affect in 1998. Based on Contract, Croatian inland wa- terways on the rivers Danube, Drava and Sava are implemented in the European inland water- ways network (E-pp). Current class state of navigable rivers is not satisfied at this m...

Riverbed erosion and bottom deepening are part of natural fluvial processes in the upper stream. The increasing gradient of these changes is interconnected with the level of human influence in the river basin and riverbed as well. In time the consequences of riverbed erosion will become serious as well as dangerous, i.e. they may have an impact on...

Optimal port and breakwater design based on Benefit-Cost analysis is discussed. This procedure takes a more general view of the design as a system. A CAD method for optimal cross-section of a rubble-mound breakwater is presented. The model is composed of four parts: the general state before intervention represented by input design parameters, inter...