Peter Halaj

Slovak University of Agriculture (SPU), Landscape Engineering, Faculty Member

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Dr. M. Perumal

IIT Roorkee

David Seamon

Kansas State University

Joshua Muldavin

Sarah Lawrence College

Prajjwal Panday

Nichols College

Timothy O Randhir

University of Massachusetts Amherst

Wajid Ali

University Of Peshawar

Jan N . Bremmer

University of Groningen

Steven M. De Jong

Utrecht University

Vikram M . Agone

North Maharashtra University,Jalgaon

Pezhman Allahbakhshian Farsani

Tarbiat Modares University

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Papers by Peter Halaj

Revitalization possibilities of the river Váh old branch near the town of Komárno

Evaluation of the Impact of Stream Flow on the Mountain River Ecosystem Using the Ifim Methodology

SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings

Cultural Heritage of Small Sacral Architecture in Spis Region in Slovakia

SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings

Urban River Design: A River Restoration Case Study

IOP Conference Series: Materials Science and Engineering, 2019

Human excessive requirements on functions of aquatic ecosystems cause that surface waters often s... more Human excessive requirements on functions of aquatic ecosystems cause that surface waters often suffer from significant morphological and hydrological alterations. Human induced hydromorphological changes of rivers belong among the most common ecological problems of the water bodies and they appear in all scales of river habitat. These changes have an impact in their ecological status and need to be solved in the near future. Successful sustainable river rehabilitation depends on the identification and understanding of key processes and anthropogenic stressors. These factors enable to estimate a proper longitudinal and lateral riverine system structure including stream habitat improvements at different scales. The article summarizes the basic principles of urban river restoration, that enables to approach to the state of dynamic stability and to increase the "absorbing capacity" of freshwater ecosystem. The authors also provide the background facts and principles of the restoration design of canalized reach of the River Trnavka, which flows through an urbanised part of the city Trnava. The Trnavka River has regulated flow regime affected by operation of Boleraz reservoir located 14 km in upstream direction. The river channel capacity equals to 50 m3.s−1 with return period 100 years and ecological flow is Q=0,150 l.s−1. The heavily modified nonprismatic channel has stone and concrete stream banks. The authors have proposed increasing sinuosity of low flow channel and decreasing capacity of the oversized channel by using gravel matraces with planting different types of macrophytes. The main goal of the proposed river restoration measures was to increase aesthetic value of complex restoration design of close public space (the Rose Park) and to implement technical and biotechnical measures that may improve ecological conditions and management operation of the Trnavka River.

Evaluation of the Methodology to Assess the Influence of Hydraulic Characteristics on Habitat Quality

Water, 2020

The article aims at assessing the impact of hydraulic characteristics on the habitat quality of m... more The article aims at assessing the impact of hydraulic characteristics on the habitat quality of mountain and piedmont watercourses. The solution results from the Riverine Habitat Simulation model, where the quality of the aquatic habitat is represented by the weighted usable area (WUA), which is determined using brown trout as the bioindicator. Flow velocity and water depth are basic abiotic characteristics that determine the ratio of suitability of the instream habitat represented by the weighted usable area. The influence of these parameters on the objective evaluation of the habitat quality is the essence of the paper. The measurements were carried out during the summer period at minimum discharges for 17 mountain and piedmont streams in Slovakia. Three methods for assessing the habitat quality were tested, and differences in the results were found to be significant. The evaluation shows the optimum design methods for calculating the weighted usable area.

Peter Halaj

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