Lake restoration with and without dredging of phosphorus-enriched upper sediment layers

Does, J. van der; Verstraelen, P.J.T.; Boers, Paul; Roestel, Jan van; Roijackers, R.M.M.; Moser, Gerard

doi:10.1007/978-94-011-2432-4_18

Cited by 15 publications

(9 citation statements)

References 11 publications

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“…For example, the seepage which results in phosphorus losses (Keizer & Sinke, 1992), although quite a common feature in The Netherlands, does not occur in every lake. Furthermore, the rates of internal and external phosphorus loading and ratios of these loadings greatly differ among lakes Verstraelen et al, 1992). Should the management objectives encompass both abatement of eutrophication and re-establishment of the former plant vegetation, the ionic composition of the supply water has to be considered, for example by return through upwelling waters, characteristic of the lake ecosystems some 100 years ago (Verstraelen et al, 1992;Barendregt et al, 1992).…”

Section: Resume Recovery Of Shallow Inland Watersmentioning

confidence: 99%

“…Furthermore, the rates of internal and external phosphorus loading and ratios of these loadings greatly differ among lakes Verstraelen et al, 1992). Should the management objectives encompass both abatement of eutrophication and re-establishment of the former plant vegetation, the ionic composition of the supply water has to be considered, for example by return through upwelling waters, characteristic of the lake ecosystems some 100 years ago (Verstraelen et al, 1992;Barendregt et al, 1992). Even assigning other functions to certain polders, or parts thereof, is an alternative measure in order to restore ecosystems to their previous states (Verstraelen et al, 1992).…”

Section: Resume Recovery Of Shallow Inland Watersmentioning

confidence: 99%

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Restoration and recovery of shallow eutrophic lake ecosystems in The Netherlands: epilogue

Liere

Gulati²

1992

Restoration and Recovery of Shallow Eutrophic Lake Ecosystems in the Netherlands

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During the symposium 'Restoration and recovery of shallow lake ecosystems in The Netherlands' studies on restoration of eutrophic lakes were addressed and discussed. Many Dutch shallow lakes have received high external loadings of phosphorus through supply water that is influenced by the River Rhine and loadings in The Netherlands. Two important Action Plans (the Rhine Action Plan, the North Sea Action Plan) are now in operation to reduce nutrient emissions. The targets set are not likely to be fully reached, so that supplementary reduction of phosphorus supplied to inland fresh waters will be required. In several shallow lakes such a reduction has been achieved recently, but without leading to discernible recovery. The main causes of delay are phosphorus storage and its subsequent release from sediments and foodweb; however, the remaining extraneous phosphorus supply is often still too high. Supplementary actions are, therefore, called for. A further reduction of phosphorus inputs is suggested, besides supplementary measures proposed, viz. dredging, flushing, biomanipulation, chemomanipulation. Restoration to the past situation via upwelling groundwater appeares to be feasible in some cases. There is a common consensus that each lake behaves differently depending to its morphology, hydrology and history of eutrophication. Therefore each lake has to be studied before restoration measures can be applied. Besides, the ecosystem should not only be studied as a separate entity, but as a part of systems of a higher integration level.

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Section: Resume Recovery Of Shallow Inland Watersmentioning

confidence: 99%

Section: Resume Recovery Of Shallow Inland Watersmentioning

confidence: 99%

Restoration and recovery of shallow eutrophic lake ecosystems in The Netherlands: epilogue

Liere

Gulati²

1992

Restoration and Recovery of Shallow Eutrophic Lake Ecosystems in the Netherlands

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“…The accumulation of nutrients in lake sediments and the recycling of those nutrients via resuspension of the sediments or, in the case of phosphate, release during anoxic conditions in the hypolimnion, exacerbate eutrophication problems associated with allochthonous nutrient loading [5,6]. In such cases dredging of contaminated sediments may be necessary to improve water quality [7,8]. University Lake (Baton Rouge, Louisiana) has a long history of water quality problems that reflect in part its shallow depth and the fact that approximately 140 outflows from storm drains enter the lake.…”

Section: Introductionmentioning

confidence: 99%

Nutrients and Phytoplankton in a Shallow, Hypereutrophic Urban Lake: Prospects for Restoration

Norris

2017

Water

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University Lake, a shallow, artificial, urban lake adjacent to the campus of Louisiana State University, has a long history of water quality problems, including algal blooms, fish kills, and high concentrations of fecal indicator bacteria. Periodic dredging of the lake is necessary to prevent its return to swampland. This study was undertaken to elucidate the roles of allochthonous versus autochthonous nutrients as causes of water quality problems in the lake, with the expectation that this information would help identify strategies for lake restoration. Photosynthetic rates and concentrations of inorganic nutrients and phytoplankton pigments were measured over a period of one year. More than 90% of the chlorophyll a (chl a) in the lake was accounted for by Chlorophyceae, Cyanophyceae, and Bacillariophyceae. Concentrations of chl a, which averaged 75 µg L −1 , fluctuated weekly during dry weather by as much as a factor of four. Phytoplankton growth rates were about 30% higher 1-2 days after rain events than after periods of dry weather, the implication being that allochthonous nutrient loading has a significant effect on the dynamics of the phytoplankton community in the lake. Therefore, dredging of sediments will likely produce no long-term improvement in water quality. More than 100 storm drains currently discharge into the lake, and diversion of those drains may be the most cost-effective strategy for effecting a long-term improvement in water quality.

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“…Different zones in the dam display different eutrophication characteristics, and, for this reason, monitoring water quality at the dam wall alone may fail to detect changes at the onset of eutrophication. While internal phosphorus cycling from sediments has been shown to limit the recovery rates of phosphorus-enriched lakes (Van der Does et al, 1992) (Table 1), which increases its susceptibility to enhanced nutrient loadings (Vollenweider and Kerekes, 1980) and favours the establishment of inherently slow-growing species like C. hirundinella and M. aeruginosa (Reynolds et al, 2012). The large volume of rainfall from a nutrient-enriched catchment may have resulted in an extensive first flush which increased nutrient loads in the dam and stimulated the growth of algae.…”

mentioning

confidence: 99%

Chemical characteristics and limnology of Loskop Dam on the Olifants River (South Africa), in light of recent fish and crocodile mortalities

Oberholster¹,

Dabrowski²,

Brasseur³

et al. 2013

WSA

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A declining crocodile population and fish mortalities attributed to pansteatitis, along with increasing blooms of Microcystis aeruginosa and Ceratium hirundinella, have led to serious concerns about water quality in Loskop Dam, on the Olifants River, South Africa. Major impacts include acid mine drainage and eutrophication associated with sewage effluent. However, the specific causes of pansteatitis remain elusive. In 2011 the water chemistry and limnology of Loskop Dam were studied to determine factors that may be influencing aquatic ecosystem health. Long-term monitoring data collected by the Department of Water Affairs were analysed for trends using a seasonal Mann-Kendall trend test, and were used to determine the trophic state of Loskop Dam using the Carlson index. Multiple sites were sampled which showed the reservoir was heterogeneous with regard to nutrient concentrations, algal biomass and dissolved metals. Specifically, the transitional zone was characterised by frequent algal blooms, resulting in fluctuating dissolved oxygen (range = 2.1-14.5 mg/ℓ) and pH (range = 7.35-10.59) levels. Using total phosphorus, Secchi depth, and chlorophyll-a concentrations, the trophic state of Loskop Dam was classified as meso-to eutrophic. Significant positive trends were observed in total (Tau = 0.422) and dissolved inorganic (Tau = 0.193) phosphorus.The reservoir showed a monomictic pattern of summer stratification (October to April) and holomictic winter circulation (June to July), with an increase in the depth and extent of anoxia in the hypolimnion when compared to previous research. Simultaneous elevated concentrations of manganese (>370 µg/ℓ) and iron in nearbottom water samples coincided with hypolimnetic anoxia. Aluminium concentrations exceeded the target water quality range (>10 µg/ℓ) during summer (December) in both surface and near-bottom water samples. We conclude that fish in Loskop Dam are periodically exposed to several physiological stressors including elevated ammonia, aluminium, iron and manganese and possibly hydrogen sulphide, as well as low dissolved oxygen. While these factors have never individually been linked to pansteatitis, their combined impacts have not been studied. To ensure the sustainability of Loskop Dam, catchment management plans must focus on reducing phosphorus inputs, and continue seeking treatment solutions for mine-water associated with abandoned and working coal mines.

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Lake restoration with and without dredging of phosphorus-enriched upper sediment layers

Cited by 15 publications

References 11 publications

Restoration and recovery of shallow eutrophic lake ecosystems in The Netherlands: epilogue

Restoration and recovery of shallow eutrophic lake ecosystems in The Netherlands: epilogue

Nutrients and Phytoplankton in a Shallow, Hypereutrophic Urban Lake: Prospects for Restoration

Chemical characteristics and limnology of Loskop Dam on the Olifants River (South Africa), in light of recent fish and crocodile mortalities

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