Impact of sampling frequency on mean concentrations and estimated loads of suspended sediment in a Norwegian river: Implications for water management

Skarbøvik, Eva; Stålnacke, Per; Bogen, Jim; Bønsnes, Truls E.

doi:10.1016/j.scitotenv.2012.06.072

Cited by 52 publications

(27 citation statements)

References 24 publications

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“…TSM transports nutrients and contaminants, reduces light transmission through a water column and influences entire aquatic ecosystems [12]. Accurate spatiotemporal information on TSM distribution patterns is therefore important for understanding Lake Ecosystem dynamics and for the development of effective and quantitative monitoring of aquatic environments, in order to both protect the lake ecosystem and improve water quality management [13][14][15]. Station 8 recorded low TSM (11.93), and Station 10 recorded highest TSM (114.03).…”

Section: Dissolved Oxygen (Do)mentioning

confidence: 99%

Water Quality Assessment Based on CWQI and NDWI Indices in Mariout Lake, Egypt

Kafrawy¹

2017

MOJES

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Alexandria Governorate inhabited by 4 million people is located on the north western edge of the Nile Delta. It extends about 70 kilometers north-west of the Nile Delta. Lake Mariut, one of Egypt's Northern Lakes facing the Mediterranean Sea, is located within the Alexandria Governorate Borders. Since the last four decades. Lake Mariut falls under enormous pressure of un-planned development, pollution and land reclamation. Now-a-day, Lake Mariut suffers from pollution, reduction of its surface area, un-planned development in a way that considerable part of the lake entered into possible irreversible processes. The purpose of this study is to assess the degree of pollution in the context of CWQI (Canadian Water Quality Index) in Mariut Lake by determining various physicochemical parameters, as the concentration, PH, DO, BOD, CHL-a, TSM, NH4, TP, and NO3 during from 2010 to 2014. Using CWQI found that the water quality of the studied Lake is found according to CWQIs model which indicates that water quality of this Lake is moderate and frequently impaired for determining water quality and its area constantly decreased according to NDWI. Results of this research showed that there are large variations in parameters in different sections, and these variations are affected by different factors. Such pressures deteriorated the Lake Mariut environmental resources quality, decreased it surface area and created problems to the Large Marine Ecosystem (Eastern Mediterranean Part). The study concluded that the area of the Lake Mariut was exposed to multiple stages of drying in order to create economic development activities for the community of Alexandria Governorate. The impact of sewage disposal to parts of the Lake basins was quite obvious too.

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Section: Dissolved Oxygen (Do)mentioning

confidence: 99%

Water Quality Assessment Based on CWQI and NDWI Indices in Mariout Lake, Egypt

Kafrawy¹

2017

MOJES

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“…Spectral bands for the Landsat sensors, whose SRF functions were obtained from USGS and used to simulate Landsat-based derived Rrs using in situ measured Rrs through Equation (4). In order to determine the best band or band combination, correlation analysis between in situ TSM measurements and simulated Landsat-based derived Rrs (calculated by Equation [4] and using the visible and NIR Band values) was carried out, and the linear, quadratic, cubic, power, and exponential models of TSM against a single band or their combinations were then calibrated, respectively, with the least-squares technique. The determination coefficient (R 2 ), MAPE and RMSE were employed to evaluate the derived model.…”

Section: Algorithm Development and Validation For Landsatmentioning

confidence: 99%

“…TSM transports nutrients and contaminants, reduces light transmission through a water column and influences entire aquatic ecosystems [1]. Accurate spatiotemporal information on TSM distribution patterns is therefore important for understanding lake ecosystem dynamics and for the development of effective and quantitative monitoring of aquatic environments, in order to both protect the lake ecosystem and improve water quality management [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Landsat-Based Long-Term Monitoring of Total Suspended Matter Concentration Pattern Change in the Wet Season for Dongting Lake, China

et al. 2015

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Assessing the impacts of environmental change and anthropogenic activities on the historical and current total suspended matter (TSM) pattern in Dongting Lake, China, is a large challenge. We addressed this challenge by using more than three decades of Landsat data. Based on in situ measurements, we developed an algorithm based on the near-infrared (NIR) band to estimate TSM in Dongting Lake. The algorithm was applied to Landsat images to derive TSM distribution maps from 1978 to 2013 in the wet season, revealing significant inter-annual and spatial variability. The relationship of TSM to water level, precipitation, and wind speed was analyzed, and we found that: (1) sand mining areas usually coincide with regions that have high TSM levels in Dongting Lake; (2) water level and seven-day precipitation were both important to TSM variation, but no significant relationship was found between TSM and wind speed or other meteorological data; (3) the increased level of sand mining in response to rapid economic growth has deeply influenced the TSM pattern since 2000 due to the resuspension of sediment; and (4) TSM variation might OPEN ACCESSRemote Sens. 2015, 7 13976 be associated with policy changes regarding the management of sand mining; it might also be affected by lower water levels caused by the impoundment of the Three Gorges Dam since 2000.

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“…Braskerud, 2001;Thomas and Lewis, 1995), whilst surrogate technologies may generate meaningful high-resolution datasets (Collins et al, 2011;Owen et al, 2012). However, the application of such technology across catchments is currently unfeasible, or restricted, due to authorities seeking to reduce the cost of non-essential monitoring where possible (Skarbøvik et al, 2012). Whilst this is cause for concern, it does present an important opportunity to develop and test low-cost tools and technologies that are capable of capturing suspended sediment data at an appropriate scale for detecting changes in fine sediment dynamics, and at a resolution sufficient to inform specific catchment management strategies.…”

Section: Introductionmentioning

confidence: 99%