Balancing between retention and flushing in river networks — optimizing nutrient management to improve trophic state

Honti, Márk; Istvánovics, Vera; Kovács, Ádám

doi:10.1016/j.scitotenv.2010.06.054

Cited by 24 publications

(24 citation statements)

References 16 publications

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“…In most cases, the optimization algorithm prioritized establishment of buffer strips along low order streams. The preference for enhancing retention near low-order streams over reducing erosion on steep slopes coincided with our previous findings in a much smaller catchment (the Zala River; [10]). DIN + algal N loads decreased to 1259 t N·year −1 , primarily due to the reduction in point emission.…”

Section: Evaluation Of Management Alternativessupporting

confidence: 89%

“…It computes the main elements of the hydrologic cycle, local soil erosion and the associated mobilization of phosphorus, soil and phosphorus transport in the terrestrial areas and throughout the stream network. The model has been validated in several types of Central European catchments, the size of which ranged from a few km 2 to several thousands of km 2 [6,8,10,11]. Model applications showed good performance in both arid and wet regions.…”

Section: Catchment Modelmentioning

confidence: 99%

“…Thus, the nutrient status of agricultural soils is a direct modelling input. In previous applications of PhosFate [9][10][11], this input was accumulated from annual agricultural P surpluses/deficits estimated from statistical data (mineral fertilizers and manure, harvest) over the past 50 years. This approach, however, had several shortcomings [12].…”

Section: Agricultural Nutrient Balancementioning

confidence: 99%

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Controlling River Eutrophication under Conflicts of Interests—A GIS Modeling Approach

Honti

2015

Water

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Stream networks are highly complex systems, in which spatially complicated and temporally varying water quality patterns develop. River eutrophication is underlain by nutrient inputs across the entire stream network and is controlled by many interacting factors in an ever moving and renewing medium. These complex features must be perceived as a whole entity to control river eutrophication. The Szamos River is one of the largest tributaries of the Tisza River in Eastern Europe. It delivers high loads of nutrients and algal biomass and fundamentally influences the hydro-morphological, chemical and ecological status of the Tisza River. To improve the ecological status of the recipient river, nutrient and phytoplankton inputs from the tributary should be controlled, yet the two rivers belong to different countries, which are reluctant to harmonize management plans. This study aims at modeling trophic status of the tributary with the PhosFate nutrient emission model to outline a set of management measures that would satisfy both countries. Four management alternatives are analysed with altered landuse patterns, and management options. Each of these alternatives is evaluated against the present conditions.

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Section: Evaluation Of Management Alternativessupporting

confidence: 89%

Section: Catchment Modelmentioning

confidence: 99%

Section: Agricultural Nutrient Balancementioning

confidence: 99%

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Controlling River Eutrophication under Conflicts of Interests—A GIS Modeling Approach

Honti

2015

Water

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“…This might reflect the impact of various impoundments (reservoirs, fishponds, shallow lakes), which are common in Hungary. These impoundments significantly elongate WRT, enhance the exploitation of nutrients, and when eutrophic, inoculate the downstream sections of the river network with substantial amounts of algae (Billen et al, 2007;Honti et al, 2010). Although limnetic species are likely to be lost during the downstream travel (Reynolds & Descy, 1996), the decrease in sestonic Chl will be small at short WRT.…”

Section: Determinants Of Sestonic Chlmentioning

confidence: 99%

“…Although a substantial human-induced increase in both nutrient concentrations and algal biomass have been observed in rivers (Meybeck, 1982;Billen et al, 2007;Sabater et al, 2008;Honti et al, 2010), very few systematic studies examined the effect of large-scale nutrient reduction on the trophic status of running waters. Considering the lack of a well-established river eutrophication model similar to Vollenweider's model of lake eutrophication (Vollenweider & Kerekes, 1982), there is a need for empirical validation of nutrient criteria suggested for eutrophication management in rivers.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of nutrient management in controlling eutrophication of running waters in the Middle Danube Basin

Istvánovics

Honti

2012

Hydrobiologia

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Nutrient emission dropped significantly during the last two decades in the Danube Basin. To assess the effect of reduced nutrient loads on the trophic status of running waters, this regional study analyzed the relationships between nutrients (P and N) and suspended chlorophyll (Chl) using long-term monitoring data in Hungary. Including the upstream catchments of trans-boundary rivers, the study covered an approximate area of 400,000 km 2 , equivalent to the half of the entire Danube catchment. Decadal median Chl was unrelated to P and N concentrations in the whole data set and weakly related to total P (TP) at natural-moderately polluted (N-MP) sites, which were distinguished from highly polluted (HP) sites by using cutoff values for chloride, chemical oxygen demand and TP. At both the N-MP sites and most of the HP sites, Chl increased with channel length. This indicated that water residence time was a more important determinant of Chl than nutrients. Nutrient concentrations showed a significant downward trend in time at half of our sites. With a nearly equal frequency, a parallel trend might or might not occur in Chl. The apparent efficiency of nutrient management was expressed as the quotient of the slopes of linear trends in Chl and nutrients. At sites within 150 km from source, this efficiency was marginal. In larger rivers, efficiency improved steeply. The highest efficiency was observed in the downstream reach of the Danube (upstream length [1,300 km) where P availability might frequently limit algal growth. The results suggest that eutrophication management in rivers should be based on Chl response functions, rather than universal nutrient criteria. Four Chl response classes were identified based on the observed longitudinal P and Chl gradients.

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The effects of hydraulic works and wetlands function in the Salado-River basin (Buenos Aires, Argentina)

Bazzuri

Gabellone

Solari

2018

Environ Monit Assess

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Man-made activities exert great influences on fluvial ecosystems, with lowland rivers being substantially modified through agricultural land use and populations. The recent construction of drainage canals in the upper stretch of the Salado-River basin caused the mobilization of huge amounts of salts formerly stored in the groundwater. The main aim of this work was to analyze the effect of the discharges of those canals into the Salado-River water, under different hydrologic conditions, and the role of the wetlands and shallow lakes placed along the canals' system. Physicochemical variables were measured and water samples were taken during times of high water, mean flows, drought, and extreme drought. The environmental variables and the plankton development were related to the hydrologic regime and reached minimum values during floods because of low temperatures and dilution. Local effects on the water's ionic composition became pronounced during droughts because of groundwater input. Nutrient concentrations were mainly associated with point wastewater discharges. Conductivity, ion concentrations, total plankton biomass, and species richness increased in the Salado-River downstream site, after the canals' discharges. The artificial-drainage system definitely promotes the incorporation of salts into the Salado-River basin. In this scenario, a careful hydraulic management is needed to take into account this issue of secondary salinization that threatens the economic exploitation of the region. The wetlands present in this study acted as service environments not only helping to reduce salt, nutrient, and suspended-solid concentrations downstream but also contributing a plethora of species and plankton biomass into the Salado-River main course.

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Balancing between retention and flushing in river networks — optimizing nutrient management to improve trophic state

Cited by 24 publications

References 16 publications

Controlling River Eutrophication under Conflicts of Interests—A GIS Modeling Approach

Controlling River Eutrophication under Conflicts of Interests—A GIS Modeling Approach

Efficiency of nutrient management in controlling eutrophication of running waters in the Middle Danube Basin

The effects of hydraulic works and wetlands function in the Salado-River basin (Buenos Aires, Argentina)

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