1. Advances in monitoring and understanding the dynamics of suspended-sediment transport in the river Drava, Slovenia: an analysis more than a decade-longJanja Kramer Stajnko, Renata Jecl, Matjaž P. Nekrep, 2023, izvirni znanstveni članek Opis: Managing sediment transport in streams is crucial to the surface water resource development strategy and has several implications for flood risk and water management, hydropower use, and balancing river morphology. This paper summarises the movement and behaviour of suspended sediment within the Slovenian portion of the River Drava, covering a span of thirteen years from 2005 to 2018. An analysis of relevant data collected during this period is also presented. Suspended-sediment dynamics strongly depend on flow velocity, seasonal variations in sediment sources, and human interventions in the riverbed. The transportation of material in the River Drava results in the accumulation of sediments in reservoirs and riverbeds, consequently impeding the natural hydrological cycle by reducing the outflow into aquifers. The 2018 high-water event is analysed in terms of the dependence of concentration of suspended sediments on discharge, where counterclockwise hysteresis was observed, providing an essential clue to the origin of sediment. Sediments from the River Drava in Slovenia are managed with some conventional processes and are mainly deposited or reintegrated into rivers and aquatic ecosystems. Some additional sediment management strategies with long-term solutions for efficient and comprehensive water management, hydropower, and ecological problems are proposed.
Ključne besede: sediment transport, streams, suspended sediment dynamics, suspended sediment transport, river Drava, sediment management, monitoring, water management
Objavljeno v DKUM: 13.09.2023; Ogledov: 476; Prenosov: 43
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2. Analysis of concentration and sedimentation of suspended load in the reservoirsHelena Vrecl-Kojc, Bojana Dolinar, Roman Klasinc, Ludvik Trauner, 2008, izvirni znanstveni članek Opis: This paper deals with the sedimentation of suspended load in the reservoirs. As an example the reservoir of the hydroelectric power plant Boštanj on the Sava River is shown. The objective of the described studies was to determine the quantity and type of deposited material in the reservoir during the selected time period. For this purpose, the mineral and chemical composition, and the concentration and the particle size of the suspended load at the intake of the water into the reservoir and at its outflow were examined. In order to determine the concentration of the suspended load, 24 water samples from the area of the intake and outflow from the reservoir were taken. At the same time the discharge of the Sava River was measured. Solid particles were removed from the water with the help of sedimentation and in the final stage of water evaporation. The results of the studies showed that the concentration of the suspended material was changing in relation to the location and the flow rate of the water. This ratio can be described with an exponential function.
In suspended load composition carbonates, muscovite/illite and quartz dominate; however, chlorite was also found, as well as small quantities of plagioclase and organic detritus. With regard to the size of the particles the examined samples are classified as silt.
It was determined that the concentration of the suspended load, at the same flow rate of water, at the intake into the reservoir is larger than at the outflow. The difference is represented by the material that was sedimented in the reservoir due to the decreased speed of the water as a result of the river's impoundment. A comparison of the composition of the samples from both collection sites showed that at the outflow site of the water from the reservoir there is a somewhat smaller share of carbonate grains and heavy minerals than at the intake site, and a higher content of organic detritus and clay particles can also be observed. Considering the actual discharge of water in the period between July 2006 and July 2007 and the examined ratio between the flow rate of the water and the quantity of suspended and deposited material, the total quantity of sedimented material in this period was estimated.
Ključne besede: suspended load, sedimentation, sediment transport, water storage reservoir
Objavljeno v DKUM: 05.06.2018; Ogledov: 2091; Prenosov: 84
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3. Analiza vsebnosti in transporta suspendiranih sedimentov na izbranem mestu v reki DraviMarko Vinkovič, 2016, delo diplomskega projekta/projektno delo Opis: V diplomski nalogi smo predstavili probleme, ki jih povzročajo suspendirani sedimenti v rekah z okoljevarstvenega in inženirskega stališča. Predstavljeni so nekateri načini izvajanja meritev. Posebej smo opisali metodo merjenja z akustičnim Dopplerjevim merilnikom pretokov s katero so se opravljale meritve na Fakulteti za Gradbeništvo prometno inženirstvo in arhitekturo. Podatke meritev, ki so se opravljale na izbranih mestih na reki Dravi smo uporabili za namene analize, kar predstavlja osnovo za nadaljnjo modeliranje vsebnosti in dinamike suspendiranih sedimentov
Ključne besede: suspendirani, sediment, transport, analiza, meritve
Objavljeno v DKUM: 21.09.2016; Ogledov: 1542; Prenosov: 136
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