Effects of dams and reservoirs on the hydrological characteristics of the lower drava river

Bonacci, Ognjen; Tadić, Zdenko; Trninić, Dušan

doi:10.1002/rrr.3450070405

Cited by 20 publications

(13 citation statements)

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“…Large engineering works in the whole Danube basin and on the rivers themselves, constructed during past centuries, have caused many different changes to the hydrological, morphological as well as air and water temperature regimes along the River Danube, and its tributaries in Croatia (Bonacci and Trninić, 1991;Bonacci et al, 1992;Bonacci and Ljubenkov, 2007).…”

Section: Study Areamentioning

confidence: 99%

Analysis of the water temperature regime of the Danube and its tributaries in Croatia

Bonacci

Trninić

Roje-Bonacci

2008

Hydrological Processes

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Abstract:Changes in water temperature along stretches of the Kupa, Sava, Drava and Danube Rivers measured in Croatia during the last 20-60 years were investigated. Characteristic (minimum, mean and maximum) annual water temperatures measured at 15 discharge and water temperature stations are analysed. Massive construction on the Danube River basin and on the rivers themselves during the last centuries, as well as recent climate change and/or variability has caused many different and possibly dangerous changes to its water temperature regime. Water temperature, as one of the most important physical characteristics of river water, strongly affects all other physical, chemical and biological processes in the river system. The investigation focuses on changes that have occurred during the last 20-odd years, probably caused by climate change and/or variability. Methods of rescaled adjusted partial sums (RAPS) as well as regression and correlation analyses are used in order to explain changes in water temperature regimes. The water-air temperature relationship is also discussed in the article. In all analysed cases, water temperature is strongly and directly affected by air temperature. There is evidence in the time series of rises in the minimum and mean annual water temperatures of the River Danube and its main tributaries in Croatia (the Kupa, Sava and Drava Rivers). The rising of mean annual air as well as water temperatures is shown to have started in 1988.

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Section: Study Areamentioning

confidence: 99%

Analysis of the water temperature regime of the Danube and its tributaries in Croatia

Bonacci

Trninić

Roje-Bonacci

2008

Hydrological Processes

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“…Major activities on the Drava River regulation and canalization started in the beginning of the nineteenth century and continued to the middle of the 20th century (Bonacci et al 1992;Biondić 1999). Numerous groundwater well fields for public water supply and irrigation systems were built in the Drava River catchment.…”

Section: Introductionmentioning

confidence: 99%

The changes in the lower Drava River water level, discharge and suspended sediment regime

Bonacci

Oskoruš

2009

Environ Earth Sci

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Massive construction on the Drava River basin and on the river itself during the last centuries, as well as recent climate change and/or variability, has caused many different and possibly dangerous changes to its hydrological and ecological regime. Since 1975, numerous hydrotechnical works have been carried out on the 60-km long section of the Drava River from the Slovenian-Croatian border to the River Mura mouth. Three hydrotechnical power plants with three reservoirs and three long inlet and outlet canals have been built. Changes in water level, discharge and suspended sediment yield along the Drava River measured in Croatia, downstream of the three Croatian reservoirs, during the last 30-130 years are presented. The investigation focuses on changes that have occurred during the last thirty-odd years, caused by the anthropogenic influences on the Drava River watercourse and its catchment in Croatia and Hungary, and probably by climate change or variability. Methods of rescaled adjusted partial sums, statistical tests, as well as regression and correlation analyses are used to explain changes in water level, discharge and suspended sediment yield. There is evidence in the time series of decreases in the minimum, mean and maximum annual water levels, and minimum and mean discharges on the lower part of the Drava River. One of the main objectives of this study was to examine the effect of dams and reservoirs operation on the changes in the downstream suspended sediment regime. The amount of suspended sediment has been greatly reduced, which can cause serious consequences.

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“…Dams directly influence sediment transport, which alters the integrity of the channel downstream. The bottom of the Drava River in Hungary has been lowered an average of 2-4cm per year by bed erosion due to reduced sediment supply from upstream impoundment (Bonnacci et al, 1992). Rivers with low level weirs may exhibit variable conditions of channel aggradation and degradation in response to bed slope adjustments within their weir pools.…”

Section: Introductionmentioning

confidence: 99%

Water allocation for ecosystem management of the Missouri River

Hesse¹

1995

Regul. Rivers: Res. Mgmt.

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Historically the hydrograph of the Missouri River had high and low discharge components. Low flows occurred from July through to early March. The period was characterized by declining thalweg velocity, reduced depth and exposed sand bars. Flood control was initiated as early as 1937 when the first mainstem dam was completed: however, it was not until after 1944 that a rigorous effort to control the wild Missouri River occurred. By 1954 sufficient reservoir storage had been built to allow complete re-organization of the hydrograph to minimize floods and facilitate navigation. The present managed hydrograph (plan 111) is compared with four operational alternatives. Plan I was selected by a team of environmental advisers and it was patterned after the natural hydrograph, but with some adjustments to minimize flood damage and to provide only minimal benefits to navigators. Plan I1 was selected as the preferred alternative in the environmental impact analysis and it was much more sensitive to the preservation of flood control and navigation benefits. Plan IV was a run of the river alternative, but with the reservoirs present, and, finally, plan V was a true run of the river under pre-dam conditions.

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Effects of dams and reservoirs on the hydrological characteristics of the lower drava river

Cited by 20 publications

References 4 publications

Analysis of the water temperature regime of the Danube and its tributaries in Croatia

Analysis of the water temperature regime of the Danube and its tributaries in Croatia

The changes in the lower Drava River water level, discharge and suspended sediment regime

Water allocation for ecosystem management of the Missouri River

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