Modelling Phosphorus Retention in Lakes and Reservoirs

Hejzlar, Josef; Šámalová, K.; Boers, Paul; Kronvang, Brian

doi:10.1007/s11267-006-9032-7

Cited by 31 publications

(28 citation statements)

References 11 publications

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“…As shown in Fig. S1, the modelpredicted R TP and R RP values exhibit positive trends with the hydraulic residence time, τ r , as expected from the literature (28)(29)(30). The trends are fitted to the classic Vollenweider model for P sequestration in lakes (Eq.…”

Section: Methodssupporting

confidence: 70%

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Global phosphorus retention by river damming

Maavara

Parsons

Ridenour

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

380

193

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More than 70,000 large dams have been built worldwide. With growing water stress and demand for energy, this number will continue to increase in the foreseeable future. Damming greatly modifies the ecological functioning of river systems. In particular, dam reservoirs sequester nutrient elements and, hence, reduce downstream transfer of nutrients to floodplains, lakes, wetlands, and coastal marine environments. Here, we quantify the global impact of dams on the riverine fluxes and speciation of the limiting nutrient phosphorus (P), using a mechanistic modeling approach that accounts for the in-reservoir biogeochemical transformations of P. According to the model calculations, the mass of total P (TP) trapped in reservoirs nearly doubled between 1970 and 2000, reaching 42 Gmol y −1 , or 12% of the global river TP load in 2000. Because of the current surge in dam building, we project that by 2030, about 17% of the global river TP load will be sequestered in reservoir sediments. The largest projected increases in TP and reactive P (RP) retention by damming will take place in Asia and South America, especially in the Yangtze, Mekong, and Amazon drainage basins. Despite the large P retention capacity of reservoirs, the export of RP from watersheds will continue to grow unless additional measures are taken to curb anthropogenic P emissions.phosphorus | river damming | biogeochemical cycles | nutrient retention | eutrophication

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Section: Methodssupporting

confidence: 70%

“…P retention in lakes and reservoirs correlates with the hydraulic residence time (τ r ) (28)(29)(30). Accordingly, τ r explains more than 45% of the variability of the R TP and R RP values generated by 6,000 Monte Carlo iterations of the P mass balance model.…”

Section: P Retention In Dammentioning

confidence: 99%

Global phosphorus retention by river damming

Maavara

Parsons

Ridenour

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

380

193

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“…Hejzlar et al [2006], Kelly et al [1987], Vollenweider [1975). Limnologists studying phosphorus retention commonly use the Vollenweider equation [1975], which conceptualizes the lake as a continuously stirred tank reactor (CSTR) with an effective removal rate constant σ (also referred to as the volumetric rate constant kv,C, [T -1 ]) that can be estimated based on the percent removal R and the mean water residence time ( Table 1).…”

Section: Methods Of Modelling Nutrient Retention In Lentic Systemsmentioning

confidence: 99%

“…As with lotic ecosystems, Hejzlar et al [2006] synthesized data to estimate the phosphorus retention of approximately 200 lakes and reservoirs, finding an inverse relationship between the phosphorus removal rate constant and residence time. Similarly, Brainard and Fairchild [2012] studied small constructed ponds and found that the area-specific sediment accumulation rates were inversely proportional to the pond surface area.…”

Section: Background and Motivationmentioning

confidence: 99%

Biogeochemical hotspots: Role of small water bodies in landscape nutrient processing

Cheng

Basu

2017

Water Resources Research

193

157

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Increased loading of nitrogen (N) and phosphorus (P) from agricultural and urban intensification has led to severe degradation of inland and coastal waters. Lakes, reservoirs, and wetlands (lentic systems) retain these nutrients, thus regulating their delivery to downstream waters. While the processes controlling N and P retention are relatively well-known, there is a lack of quantitative understanding of how these processes manifest across spatial scales. We synthesized data from 600 lentic systems around the world to gain insight into the relationship between hydrologic and biogeochemical controls on nutrient retention. Our results indicate that the first-order reaction rate constant, k [T 21 ], is inversely proportional to the hydraulic residence time, s [T], across 6 orders of magnitude in residence time for total N, total P, nitrate, and phosphate. We hypothesized that the consistency of the relationship points to a strong hydrologic control on biogeochemical processing, and validated our hypothesis using a sediment-water model that links major nutrient removal processes with system size. Finally, the k-s relationships were upscaled to the landscape scale using a wetland size-frequency distribution. Results suggest that small wetlands play a disproportionately large role in landscape-scale nutrient processing-50% of nitrogen removal occurs in wetlands smaller than 10 2.5 m 2 in our example. Thus, given the same loss in wetland area, the nutrient retention potential lost is greater when smaller wetlands are preferentially lost from the landscape. Our study highlights the need for a stronger focus on small lentic systems as major nutrient sinks in the landscape. Plain Language Summary Excess nutrient pollution from intensive fertilizer use and farming operations poses an increasing threat to water quality worldwide. Lakes, streams, and wetlands restrict the movement of nutrients, and thus protect downstream waters. We have a limited understanding, however, of how removal processes are affected by the size and type of the water body. Based on a synthesis of data from lakes, reservoirs, and wetlands worldwide, we found that smaller water bodies tend to have higher nutrient removal rates. We applied our findings to the landscape scale and found that for the same wetland area lost, the loss of small wetlands corresponds to a greater loss in wetland nutrient removal potential. Such findings are significant to wetland protection and restoration efforts, which have historically focused on maximizing total wetland area rather than on preserving a distribution of different wetlands sizes within a landscape.

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“…), and reductions in diffuse sources (Hejzlar et al, 2006;Hoffmann et al, 2009Kronvang et al, 2009a). Such a catchment management plan allows the groundwater threshold value to be higher (average for entire catchment area is 9.3 mg N l −1 ) than in the first scenario.…”

Section: K Hinsby Et Al: Threshold Values and Management Options Fomentioning

confidence: 99%

Threshold values and management options for nutrients in a catchment of a temperate estuary with poor ecological status

Hinsby

Markager

Kronvang

et al. 2012

Hydrol. Earth Syst. Sci.

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Abstract.Intensive farming has severe impacts on the chemical status of groundwater and streams and consequently on the ecological status of dependent ecosystems. Eutrophication is a widespread problem in lakes and marine waters. Common problems are hypoxia, algal blooms, fish kills, and loss of water clarity, underwater vegetation, biodiversity and recreational value. In this paper we evaluate the nitrogen (N) and phosphorus (P) concentrations of groundwater and surface water in a coastal catchment, the loadings and sources of N and P, and their effect on the ecological status of an estuary. We calculate the necessary reductions in N and P loadings to the estuary for obtaining a good ecological status, which we define based on the number of days with N and P limitation, and the corresponding stream and groundwater threshold values assuming two different management options. The calculations are performed by the combined use of empirical models and a physically based 3-D integrated hydrological model of the whole catchment. The assessment of the ecological status indicates that the N and P loads to the investigated estuary should be reduced to levels corresponding to 52 and 56 % of the current loads, respectively, to restore good ecological status. Model estimates show that threshold total N (TN) concentrations should be in the range of 2.9 to 3.1 mg l −1 in inlet freshwater (streams) to Horsens estuary and 6.0 to 9.3 mg l −1 in shallow aerobic groundwater (∼ 27-41 mg l −1 of nitrate), depending on the management measures implemented in the catchment. The situation for total P (TP) is more complex, but data indicate that groundwater threshold values are not needed. The stream threshold value for TP to Horsens estuary for the selected management options is 0.084 mg l −1 . Regional climate models project increasing winter precipitation and runoff in the investigated region resulting in increasing runoff and nutrient loads to the Horsens estuary and many other coastal waters if present land use and farming practices continue. Hence, lower threshold values are required in many coastal catchments in the future to ensure good status of water bodies and ecosystems.

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Modelling Phosphorus Retention in Lakes and Reservoirs

Cited by 31 publications

References 11 publications

Global phosphorus retention by river damming

Global phosphorus retention by river damming

Biogeochemical hotspots: Role of small water bodies in landscape nutrient processing

Threshold values and management options for nutrients in a catchment of a temperate estuary with poor ecological status

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