The role of the Kis-Balaton Water Protection System in the control of water quality of Lake Balaton

Tátrai, István; Mátyás, Kálmán; Korponai, János; Paulovits, Gábor; Pomogyi, Piroska

doi:10.1016/s0925-8574(00)00091-4

Cited by 64 publications

(42 citation statements)

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“…1) with the main function of retaining inorganic nutrients and total suspended solids carried by the Zala; ii) a marshland with 95% helophyte coverage (P. australis and Carex ssp. meadows; Tátrai et al, 2000), that plays an important role in the nutrient filtration process as shown by dömötörfy et al (2003). at the local scale, the shallow eutrophic lake hídvégi is colonized by floating-leaved macrophytes, with dense Trapa natans l. beds, as well as Nuphar lutea (l.) sm., and Nymphaea alba l. populations (dömötörfy et al, 2003; dinka et al, 2008), and by submerged species in some littoral zones (Ceratophyllum demersum l., and Najas marina l.).…”

Section: Study Sitesmentioning

confidence: 94%

“…We must point out that the nutrient stock in T. natans meadows is likely to be an underestimation of the real nutrient uptake because we only considered above-water biomass (e.g., in July above and below water biomass of Tn were 60% and 40% of total biomass; Pinardi et al, 2011) and without leaf turnover during the whole vegetative period (e.g., by doubling the maximum standing stock; galanti and Topa esposito, 1996). if we assume that these values are generally representative of the allocation of biomass above and below water, and an equal allocation of nutrients for above and below water plant parts, then we estimate that the total nutrient storage in T. natans biomass is up to 11.7 n t and 1.3 P t. according to published works describing nutrient or chemical inflow and water discharge data over time, we calculate a total load for the growing season period (May-october) of 72-206 t n and 6-13 t P (szilagyi et al, 1990;Pomogyi, 1993;Tátrai et al, 2000;hatvani et al, 2011;horváth et al, 2013;Paulovits et al, 2014). The comparison of nutrient content in macrophyte beds derived from aPeX maps with nutrient load inflowing by the Zala river evidenced that about 6-16% and 10-21% of n and P, respectively, can be temporarily stored in T. natans biomass.…”

Section: Nutrient Removal Capacity In Lake Hídvégimentioning

confidence: 99%

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Remote sensing of macrophyte morphological traits: Implications for the management of shallow lakes

et al. 2017

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Macrophytes are important elements of freshwater ecosystems, fulfilling a pivotal role in biogeochemical cycles. The synoptic capabilities provided by remote sensing make it a powerful tool for monitoring aquatic vegetation characteristics and the functional status of shallow lake systems in which they occur. The latest generation of airborne and spaceborne imaging sensors can be effectively exploited for mapping morphologically -and physiologically -relevant vegetation features based on their canopy spectral response. The objectives of this study were to calibrate semi-empirical models for mapping macrophyte morphological traits (i.e., fractional cover, leaf area index and above-water biomass) from hyperspectral data, and to investigate the capabilities of remote sensing in supporting macrophyte monitoring and management. We calibrated spectral models using in situ reflectance and morphological trait measures and applied them to airborne hyperspectral imaging data, acquired over two shallow european water bodies (lake hídvégi, in hungary, and Mantua lakes system, in italy) in two key phenological phases. Maps of morphological traits were produced covering a broad range of aquatic plant types (submerged, floating, and emergent), common to temperate and continental regions, with an error level of 5.4% for fractional cover, 0.10 m 2 m -2 for leaf area index, and 0.06 kg m -2 for abovewater biomass. Based on these maps, we discuss how remote sensing could support monitoring strategies and shallow lake management with reference to our two case studies: i.e., by providing insight into spatial and species-wise variability, by assessing nutrient uptake by aquatic plants, and by identifying hotspot areas where invasive species could become a threat to ecosystem functioning and service provision.

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Section: Study Sitesmentioning

confidence: 94%

Section: Nutrient Removal Capacity In Lake Hídvégimentioning

confidence: 99%

Remote sensing of macrophyte morphological traits: Implications for the management of shallow lakes

et al. 2017

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“…Since the early 1980s, significant effort has been invested in improving its water quality (Tátrai et al, 2000). The construction of Kis-Balaton reservoir and wetland system was one of the main engineering controls built to reduce nutrient inflow from the Zala River and the overall loading within the lake.…”

Section: Study Sitementioning

confidence: 99%

Spatio-seasonal variability of chromophoric dissolved organic matter absorption and responses to photobleaching in a large shallow temperate lake

et al. 2017

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Abstract. The development and validation of remotesensing-based approaches for the retrieval of chromophoric dissolved organic matter (CDOM) concentrations requires a comprehensive understanding of the sources and magnitude of variability in the optical properties of dissolved material within lakes. In this study, spatial and seasonal variability in concentration and composition of CDOM and the origin of its variation was studied in Lake Balaton (Hungary), a large temperate shallow lake in central Europe. In addition, we investigated the effect of photobleaching on the optical properties of CDOM through in-lake incubation experiments. There was marked variability throughout the year in CDOM absorption in Lake Balaton (a CDOM (440) = 0.06-9.01 m −1 ). The highest values were consistently observed at the mouth of the main inflow (Zala River), which drains humic-rich material from the adjoining Kis-Balaton wetland, but CDOM absorption decreased rapidly towards the east where it was consistently lower and less variable than in the westernmost lake basins. The spectral slope parameter for the interval of 350-500 nm (S CDOM (350-500)) was more variable with increasing distance from the inflow (observed range 0.0161-0.0181 nm −1 for the mouth of the main inflow and 0.0158-0.0300 nm −1 for waters closer to the outflow). However, spatial variation in S CDOM was more constant exhibiting a negative correlation with a CDOM (440). Dissolved organic carbon (DOC) was strongly positively correlated with a CDOM (440) and followed a similar seasonal trend but it demonstrated more variability than either a CDOM or S CDOM with distance through the system. Photobleaching resulting from a 7-day exposure to natural solar UV radiation resulted in a marked decrease in allochthonous CDOM absorption (7.04 to 3.36 m −1 , 42 % decrease). Photodegradation also resulted in an increase in the spectral slope coefficient of dissolved material.

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“…This resulted in the water quality deterioration of Lake Balaton. As a solution to the problem of nutrient retention at the mouth of the River Zala and stop the degradation of Balaton's water quality the KBWPS was constructed (Tátrai et al, 2000;Kovács et al, 2010). …”

Section: The Kis-balaton Water Protection System (Kbwps)mentioning

confidence: 99%

Analysis of Water Quality Data for Scientists

Kovács¹,

Tanos²,

Korponai³

et al. 2012

Water Quality Monitoring and Assessment

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The role of the Kis-Balaton Water Protection System in the control of water quality of Lake Balaton

Cited by 64 publications

References 1 publication

Remote sensing of macrophyte morphological traits: Implications for the management of shallow lakes

Remote sensing of macrophyte morphological traits: Implications for the management of shallow lakes

Spatio-seasonal variability of chromophoric dissolved organic matter absorption and responses to photobleaching in a large shallow temperate lake

Analysis of Water Quality Data for Scientists

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