Point and nonpoint sources of nutrients to lakes – ecotechnological measures and mitigation methodologies – case study

Gunes, Kemal

doi:10.1016/j.ecoleng.2008.07.004

Cited by 34 publications

(13 citation statements)

References 14 publications

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“…The contribution of atmospheric N input (36.52 % in 2005, 64.01 % in 2006, 47.91 % in 2007 and 79.30 % in 2008), with an annual averaged contribution of 50.64 % was higher than that of P (2.12 % in 2005, 7.94 % in 2006, 2.38 % in 2007, and 17.16 % in 2008, with an average of 3.58 %). This result supported the view that NPS-N was linked to atmospheric acid deposition, while the upstream watershed was the main source of NPS-P (Gunes 2008). However, as described in Chen et al (2008), atmospheric N deposition accounted for only 30 % of total N input into the receiving water body.…”

Section: Atmospheric Deposition Load Estimationsupporting

confidence: 71%

Integrated assessment of nonpoint source pollution of a drinking water reservoir in a typical acid rain region

Chen

Liu

Huang

et al. 2013

Int. J. Environ. Sci. Technol.

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Nonpoint source pollution generated by agricultural production and city construction has been studied for decades, but very few researches have been conducted on the regional assessment of nonpoint source pollution in the acid rain regions, particularly relating to the control of pollutant in the drinking water source areas. In this study, an integrated framework was applied to estimate nitrogen and phosphorous load in a typical acid rain influenced reservoir, China. The method comprised three separate steps: (1) a watershed model-soil and water assessment tools-was used to estimate nitrogen and phosphorous load from the upper stream watershed; (2) collection of acid rain samples, together with a GIS-based calculation to estimate the atmospheric deposition flux; (3) introduction of a simple export coefficient method. The case study indicated atmospheric deposition accounted for 56.75 % of total nitrogen load during the year, with the highest level of deposition load taking place during the wet season. Maximum phosphorous (93.37 %) was linked to the upstream runoff, originating from the upper watershed. Further analysis by watershed model and export coefficient method indicated forest exported most total nitrogen (27.72 %) and total phosphorous (58.78 %) in the upstream watershed. Results indicated that in the region influenced by acid rain, the nitrogen management should encompass the management of land use practices and the control of acid rain in catchments feeding into drinking water storage areas. It could be inferred that NOX emissions might cause both globe warming and eutrophication in the drinking water sources. This paper could provide a basis for water quality management in such regions.

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Section: Atmospheric Deposition Load Estimationsupporting

confidence: 71%

Integrated assessment of nonpoint source pollution of a drinking water reservoir in a typical acid rain region

Chen

Liu

Huang

et al. 2013

Int. J. Environ. Sci. Technol.

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“…On a per hectare basis, these figures represent 20, 14, and 0.3 kg of nitrogen, phosphorus, and potassium, respectively. Additionally, approximately 195.4 tons of pesticides are used annually in the catchment [19].…”

Section: Description Of the Study Areamentioning

confidence: 99%

Hydrodynamic and Water Quality Modeling of Lake Eğirdir

Kaçıkoç

Beyhan

2014

CLEAN Soil Air Water

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The main objective of this study was to determine the impact of current point and nonpoint pollution loads on the water quality of Lake Eğirdir. For this purpose, hydrodynamics and water quality status of Lake Eğirdir were investigated by using the Delft3D model. The monthly monitoring of pH, dissolved oxygen (DO), chlorophyll‐a (Chl‐a), and forms of nitrogen and phosphorus was carried out, as was the seasonal monitoring of total organic carbon. In all, seven different sampling points were chosen from the lake and influent streams in order to monitor the lake during the period from December 2010 to November 2011, with the aim of calibrating the model. The performance of the dynamic water quality model was evaluated using the relative root mean square error (RRMSE) values for both the calibration and the validation periods. The results of the model showed that the DO had the lowest, and Chl‐a had highest associated RRMSE value. The simulation results showed that Segments 1 and 7 of the system had relatively high concentrations of almost all the pollutants. It was also found that increasing the nonpoint nutrient loads from agricultural sources has a greater effect than increasing the nonpoint nutrient loads from the inhabited areas around the lake.

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“…Implementation of a crop rotation system may, however, increase the effiuent nutrient load from the district because more fertilizer is applied to the rotation crops than to the paddy fields. The reduction of nutrients, suspended solids and organic matter load in drainage water from non-point sources is an important issue in water quality management (Gunes 2008). Various environmental measures to reduce effluent load, such as the reduction of chemical fertilizer and reuse of drainage water (cyclic irrigation), are applied in paddy-field districts.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen and phosphorus effluent loads from a paddy-field district adopting collective crop rotation

Hama

Aoki

Osuga

et al. 2012

Water Science and Technology

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Japanese paddy rice systems commonly adopt the rotation of vegetables, wheat and soybeans with paddy rice. Crop rotation may, however, increase the nutrient load in effluent discharged from the district because more fertilizer is applied to the rotation crops than is applied to paddy crops. We investigated a paddy-field district subject to collective crop rotation and quantified the annual nutrient load of effluent from the district in three consecutive years. The total annual exports of nitrogen and phosphorus over the investigation period ranged from 30.3 to 40.6 kg N ha(-1) and 2.62 to 3.13 kg P ha(-1). The results suggest that rotation cropping increases the effluent nutrient load because applied fertilizer is converted to nitrate, and surface runoff is increased due to the absence of shuttering boards at the field outlets.

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Point and nonpoint sources of nutrients to lakes – ecotechnological measures and mitigation methodologies – case study

Cited by 34 publications

References 14 publications

Integrated assessment of nonpoint source pollution of a drinking water reservoir in a typical acid rain region

Integrated assessment of nonpoint source pollution of a drinking water reservoir in a typical acid rain region

Hydrodynamic and Water Quality Modeling of Lake Eğirdir

Nitrogen and phosphorus effluent loads from a paddy-field district adopting collective crop rotation

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