Restoration of flow-through lakes – Theory and practice

Dunalska, Julita; Napiórkowska‐Krzebietke, Agnieszka; Lawniczak-Malińska, Agnieszka E.; Bogacka-Kapusta, Elżbieta; Wiśniewski, Grzegorz

doi:10.1016/j.ecohyd.2018.06.009

Cited by 11 publications

(5 citation statements)

References 19 publications

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“…This emphasises the need to decontaminate the lake completely by arresting external sources of pollution and the removal of endogenous elements, which entails desilting, which helps in the removal of accumulated contaminants in sediments. Chemical treatment to reduce the productivity of Lake Wolsztynskie water did not bring about permanent improvement of the water quality (Dunalska et al, 2018). Rate and magnitude of recovery of Lake Okeechobee seems to depend on the residence time of lake and the available P in sediments to drive internal loading (James & Pollman, 2011).…”

Section: Annadotter Et Al 1999mentioning

confidence: 99%

Efficacy of Rejuvenation of Lakes in Bengaluru, India

Ramchandra¹,

Sincy

Asulabha

2020

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Purpose of the study: The main objective of the present work is to assess the efficacy of the restoration endeavour in Bengaluru lakes, Karnataka, India. Rapid urbanisation coupled with industrialisation in urban areas has greatly stressed the available water resources qualitatively and quantitatively. This has also resulted in the generation of enormous sewage and wastewater after independence. Method: Environmental monitoring of 40 restored lakes was carried out to identify the key issues and assessing water quality (physical, chemical and biological). Weighted arithmetic water quality index (WQI) and Pearson’s correlation coefficient (r) was determined using data of physicochemical parameters of lakes. Principal Component Analysis (PCA) performed using PAST3 software to identify the factors responsible for variations in water quality. Main Findings: The monitored forty lakes distributed across the three major watersheds namely Koramangala and Challaghatta valley, Vrishabhavathi valley and Hebbal valley were grouped under three different WQI status like good water quality (10%); poor water quality (37%) and very poor water quality (53%). Majority of these restored lakes has become polluted which indicates improper decontamination and poor maintenance of restored lakes. Application of this study: This study provides vital information for policymakers to understand the gaps which helps in the course correction while implementing further rejuvenation of lakes. Novelty/Originality of this study: The efficacy of rejuvenation was assessed through integrated cost-effective scientific approaches for the lake monitoring. Monitoring during the pre and post rejuvenation period has aided in assessing the efficacy of rejuvenation, which is done for the first time in India.

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Section: Annadotter Et Al 1999mentioning

confidence: 99%

Efficacy of Rejuvenation of Lakes in Bengaluru, India

Ramchandra¹,

Sincy

Asulabha

2020

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“…hydrological/morphometric features of a water body and its catchment) as well as lake services from an economic aspect. Flow-through lakes are especially challenging due to their large catchment areas that determine multiple pollution sources (Dunalska et al 2018).…”

Section: Lake Managementmentioning

confidence: 99%

“…Another approach for through-flow lakes fed by very fertile river waters was proposed in the case of Lake Wolsztyńskie (Western Poland) i.e. the re-direction of the main tributary directly to the outflow (Dunalska et al 2018). Such an approach would be possible in Lake Łeknenskie as the distance between the inflow and the outflow is less than 600 m, nevertheless, an economic justification would be necessary as well as a more detailed hydrological analyses, considering possible changes in lake water level fluctuations.…”

Section: Lake Managementmentioning

confidence: 99%

A shallow lake in an agricultural landscape – water quality, nutrient loads, future management

Dondajewska

Gołdyn

Messyasz

et al. 2019

Limnological Review

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Qualitative analyses of nitrogen and phosphorus loads reaching the lake ecosystem provide a basis for pollution control, which is of paramount importance in shallow lakes due to the rapid turn-over of matter and energy. The studies of both external and internal loading were conducted in Lake Łeknenskie, a very shallow, through-flow lake situated in Western Poland. Strong eutrophication is manifested in rich rush vegetation and a lack of submerged macrophytes as well as nitrogen and phosphorus concentrations (max 13.04 mg N dm−3 and 0.32 mg P dm−3, respectively). Constant domination of cyanobacteria in the phytoplankton community was noted in almost all seasons with a 98% share in summer, resulting in 20 cm water transparency and 223 μg dm−3 of chlorophyll-a. The zooplankton community was dominated by rotifers. The main source of nutrients was the River Nielba. Spatial external nutrient loading was 1.93 g P m−2 yr−1 and 77.55 g N m−2 yr−1. An even higher load of phosphorus was released from the bottom sediments, 2.18 g P m−2 yr−1. A comprehensive action plan is required, aiming at the reduction of both external and internal nutrient loading. A series of solutions regarding local environmental conditions should be applied in the lake catchment, including biogeochemical barriers, denitrification walls, artificial retention basins or wetlands, but most of all – improvement in the functioning of the wastewater treatment plant. Restoration is possible, however, protection measures reducing external loading should be undertaken prior to phosphorus inactivation in the water column and in the bottom sediments, supported by biological methods e.g. biomanipulation.

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“…The improvement of lake water quality under the European Union Water Framework (Directive, 2000 ) is challenging, especially in flow-through lakes, where it is impossible to eliminate all sources of pollution (Dunalska et al, 2018 ; Tekile et al, 2015 ). The river and the lake form an integral whole in the river–lake system, and they have a significant impact on each other.…”

Section: Introductionmentioning

confidence: 99%

“…Physico-chemical parameters were analysed monthly at five stations. The nutrient concentrations at the inflows decreased over the years due to the improvement of water and sewage management (Dunalska et al, 2018;Tekile et al, 2015). The river and the lake form an integral whole in the river-lake system, and they have a significant impact on each other.…”

Section: Introductionmentioning

confidence: 99%

Spatio-temporal variations in water quality of a river–lake system during restoration treatments

Rosińska

Rybak²,

Kowalczewska‐Madura³

et al. 2022

Environ Monit Assess

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To fill the knowledge gap about the functioning of the lake–river system subjected to restoration treatments, two tributaries, a shallow, restored lake and its outflow, were examined. The quality of water inflows, lake and outflow was compared before (BR), during sustainable (SR, deep water aeration, phosphorus inactivation and biomanipulation for 3 years) and limited lake restoration (LR, only aeration for 2 years). Physico-chemical parameters were analysed monthly at five stations. The nutrient concentrations at the inflows decreased over the years due to the improvement of water and sewage management in the catchment (in Mielcuch from 18.0 to 8.0 mgN L−1 and 1.0 to 0.6 mgP L−1). The decline at the outflow was the result of a better quality of water at the tributaries and SR in the lake. During LR, decrease of phosphorus concentration still occurred (0.11 mgP L−1), but nitrogen concentration slightly increased (3.9 mgN L−1). Although the outflowing waters still transported a high content of chlorophyll a and suspended solids during SR, their amount was lower (34.5 μg L−1 and 17 mg L−1, respectively) than that during BR and LR. During restoration, it is significant to monitor the water quality not only in the lake but also at the outflow. The slow deterioration of water quality at the outflow indicated that introducing changes in the applied restoration methods must be done carefully because the previously achieved effect may be lost. Hence, restoration of the upstream lake and good quality of its tributaries are of great importance for water bodies located downstream.

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Restoration of flow-through lakes – Theory and practice

Cited by 11 publications

References 19 publications

Efficacy of Rejuvenation of Lakes in Bengaluru, India

Efficacy of Rejuvenation of Lakes in Bengaluru, India

A shallow lake in an agricultural landscape – water quality, nutrient loads, future management

Spatio-temporal variations in water quality of a river–lake system during restoration treatments

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