Estimating internal P loading in a deep water reservoir of northern China using three different methods

Qin, Lang; Zeng, Qinghui; Zhang, Wangshou; Li, Xuyong; Steinman, Alan D.; Du, Xinzhong

doi:10.1007/s11356-016-7035-0

Cited by 14 publications

(14 citation statements)

References 78 publications

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“…Phosphorus release is believed to play a significant role in the process of eutrophication of water bodies (Gao et al 2005 ; Brzozowska et al 2013 ). Much attention was paid to reducing external loading of nutrients in order to improve water quality; however, internal loading from sediments, which was largely neglected, is also an important source for water eutrophication (Qin et al 2016 ). The intensity and duration of P release may have a significant impact on its concentration in lake water and subsequently on lake water quality (Jeppesen et al 1991 ; Gonsiorczyk et al 1997 ).…”

Section: Introductionmentioning

confidence: 99%

The influence of restoration measures on phosphorus internal loading from the sediments of a hypereutrophic lake

Kowalczewska‐Madura

Dondajewska

Gołdyn

et al. 2017

Environ Sci Pollut Res

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Uzarzewskie Lake was a hypereutrophic, dimictic lake characterized by low water transparency, high chlorophyll-a concentration and intense phytoplankton blooms; thus, restoration treatment was started. A chemical treatment, based on phosphorus inactivation with small doses of iron sulphate, was undertaken in 2006–2007. Nitrate-rich groundwater flowing from seepage springs was directed into the lake hypolimnion to increase redox potential since 2008. Phosphorus internal loading was reduced by more than 80% as a result of restoration treatment. In the profundal zone, where P release from the bottom sediments prevailed throughout the year, it decreased from 13.02 mg P m−2 day−1 in 2010 to 2.81 mg P m−2 day−1 in 2015. Meanwhile, in the littoral zone, P accumulation in bottom sediments predominated; hence, the mean value of internal loading was increasing from 2.61 mg P m−2 day−1 in 2011 to 10.24 mg P m−2 day−1 in 2015. The annual P load from the bottom sediments in the profundal zone was much higher than from the littoral zone as a result of (i) a higher P release in most years and (ii) the greater area of this zone (82% of the lake’s area). The fraction of residual phosphorus (Res-P) has the largest share, and in recent years, this has shown a tendency to decrease. The sum of bioavailable fractions was low (average 5.7%) showing a downward trend in recent years. Sustainable restoration of the lake resulted in a slow but steady decreasing trend in internal phosphorus loading.

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Section: Introductionmentioning

confidence: 99%

The influence of restoration measures on phosphorus internal loading from the sediments of a hypereutrophic lake

Kowalczewska‐Madura

Dondajewska

Gołdyn

et al. 2017

Environ Sci Pollut Res

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“…For the dry period, the literature reports rates ranging between 0.11 and 0.30 gP.m².month -1 with higher rates for eutrophic water bodies (Nürnberg et al 2012;Nürnberg et al 2013). High release rates are more common in eutrophic lakes (Qin et al 2016). The annual averages varied from 0.66 to 7.29 gP.m².yr -1 .…”

Section: Tp Concentrations and Mass Balance Estimatesmentioning

confidence: 99%

Phosphorus mass balance and input load estimation from the wet and dry periods in tropical semiarid reservoirs

MdJD¹,

Iel²

2021

Preprint

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The dynamics of total phosphorus (TP) in 18 strategic reservoirs of the high-density reservoir network of the Brazilian semiarid was evaluated during the wet and dry periods for the past 12 years. Seasonal TP concentrations presented no significant differences for about 90% of the reservoirs (p > 0.05). This was attributed to a trade-off between the hydrological/limnological processes occurring in the two seasons. Then, a transient complete-mix mass balance model was applied with particular adaptations for the tropical semiarid reservoirs to estimate the TP load for each season. Because of the relatively well mixed conditions and high hypolimnetic dissolved oxygen concentrations during the wet season, the wet load was assumed to represent the external TP load. On the other hand, because of the absence of reservoir inflow during the dry season, phosphorus release under anoxic sediment conditions and wind-induced resuspension under shallow water conditions, the dry load was assumed to reflect the internal TP load. The maximum external loads were related to peak inflows, notably after drought periods. Consistently, the largest internal loads were obtained during the drought periods, when the reservoirs were shallower and more prone to phosphorus release and resuspension. By comparing the impact of the two input load types, the wet period load was predominant in 72% of the reservoirs. The areal phosphorus loads ranged from 0.66 to 7.29 gP.m².yr-1, which were consistent with the literature, despite the very high density of reservoirs. Finally, power-law curves including data for all studied reservoirs were adjusted between the dry period load and volume, dry and wet period loads, wet period load and inflow, and total load and catchment area, resulting in satisfactory R² (0.66–0.82).

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“…For example, an analysis covering 35 lakes revealed that 10-15 years would be required for total phosphorus (TP) to reach a new equilibrium after the external loading had been reduced (Jeppesen et al 2005). The study on the Guanting Reservoir showed that considerable amounts of nutrients and heavy metals had been stored in the sediments, such that the average sediment P concentration was 838 g g −1 (Zhou 2002), while the value in the Miyun Reservoir (a drinking water source for Beijing) was 687.71 g g −1 (Qin et al 2016). Hence, more attention should be paid to internal loading from sediments for the Guanting Reservoir.…”

Section: The Potential Drivers Of Trends In Water Qualitymentioning

confidence: 99%

Estimating internal P loading in a deep water reservoir of northern China using three different methods

Cited by 14 publications

References 78 publications

The influence of restoration measures on phosphorus internal loading from the sediments of a hypereutrophic lake

The influence of restoration measures on phosphorus internal loading from the sediments of a hypereutrophic lake

Phosphorus mass balance and input load estimation from the wet and dry periods in tropical semiarid reservoirs

Recent water quality trends in a typical semi-arid river with a sharp decrease in streamflow and construction of sewage treatment plants

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