Turbidity and mass concentration of suspended matter in lake water: A comparison of two calibration methods

Hofmann, Annette; Dominik, Janusz

doi:10.1007/bf00878026

Cited by 24 publications

(14 citation statements)

References 16 publications

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“…The ranges of b m (550 nm) in Oct 2006, Mar 2007, and Nov 2007 in Taihu Lake were 0.221-1.551, 0.436-1.138, and 0.406-1.271, respectively. The average values of b m (550 nm) for the same periods were 0.590, 0.597, and 0.714, respectively, which are within the range of 0.1-0.8 provided by Hofmann and Dominik (1995). Upon comparing with the results of Babin et al (2003) and Stramski et al (2004b) (Table 3), b m (550 nm) for Taihu Lake was found to be similar to those for the North Sea and English Channel.…”

Section: Specific Scattering Coefficientsupporting

confidence: 74%

“…The differences between n values and the size distributions of organic and inorganic matter Some sample points with highly anomalous data were removed SD standard deviation, CV coefficient of variation (Babin et al 2003). Hofmann and Dominik (1995) considered the range of b m (550 nm) for turbid water to be 0.1-0.8. The ranges of b m (550 nm) in Oct 2006, Mar 2007, and Nov 2007 in Taihu Lake were 0.221-1.551, 0.436-1.138, and 0.406-1.271, respectively.…”

Section: Specific Scattering Coefficientmentioning

confidence: 99%

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Scattering spectrum properties and their relationship to biogeochemical parameters: a case study in Taihu Lake

Huang

Wang

et al. 2011

Limnology

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The scattering spectrum properties of highly turbid and eutrophic inland case 2 water from Taihu Lake were studied during three cruises from 2006 to 2007. The scattering [b p (k)] and backscattering [b bp (k)] coefficients and the backscattering probability (B) for Taihu Lake were found to show a clear spectral dependence, and this dependence was well simulated by a power-law function. This dependence, however, became weak when algae dominated the sample points. The mean values of the power-law index for b p (k)were -0.6712, -0.8129 and -0.7600, respectively. To interpret the spectral characteristics and mechanisms of b p (k) and b bp (k), water samples were collected simultaneously for the biogeochemical characterization of suspended particles. The average values of the specific scattering coefficients for total suspended matter, inorganic suspended matter (ISPM) and organic suspended matter (OSPM) were 0.634 (550 nm), 1.057 (532 nm), and 0.396 g m -2 (532 nm), respectively. The power-law index of b bp (k) (Y) was significantly related to ISPM/OSPM and b bp (532 nm), but only weakly related to the particle size distribution index. The mean (spatial and wavelength) values of B in were 0.0108, 0.0138, and 0.0125, respectively. B decreases with increasing ISPM concentration because of the large contribution of ISPM to b b (k) and the strong restraint on b bp (k) caused by the multi-scattering effect under high-turbidity conditions.

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Section: Specific Scattering Coefficientsupporting

confidence: 74%

Section: Specific Scattering Coefficientmentioning

confidence: 99%

Scattering spectrum properties and their relationship to biogeochemical parameters: a case study in Taihu Lake

Huang

Wang

et al. 2011

Limnology

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“…The values of mass-specific scattering coefficient, b p * (k) = b p (k)/TSM (m 2 g -1 ), generally vary between 0.1 and 0.8 m 2 g -1 in case 2 waters (Baker & Lavelle, 1984;Hofmann & Dominik, 1995;Baker et al, 2001), while the average b p m (550) in case 1 waters is around 1.0 m 2 g -1 (Gordon & Morel, 1983). Babin et al (2003) also reported similar results, that is, an average b p m (555) of 0.51 m 2 g -1 for case 2 waters and 1.0 m 2 g -1 for case 1 waters.…”

Section: Discussionmentioning

confidence: 99%

Partitioning particulate scattering and absorption into contributions of phytoplankton and non-algal particles in winter in Lake Taihu (China)

Sun

Wang

et al. 2010

Hydrobiologia

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Light scattering, backscattering, and absorption coefficients of particles were observed at 62 locations in Lake Taihu (China) in November 2008. A method using a priori knowledge and the measured data was proposed to partition particulate scattering and absorption into contributions of phytoplankton and nonalgal particles. The results showed that phytoplankton weakly contributed to the particulate scattering and backscattering with the mean b ph /b p values usually below 10% and b bph /b bt values of 0.3-3.9% in the whole visible light spectrum, and an approximate relationship of b bt & b bp & b bnap was regarded as reasonable in Lake Taihu. In contrast with scattering and backscattering, phytoplankton made more contributions to the particulate absorption with the mean a ph /a p values varying in a wide range of about 20-70%. Both the scattering and absorption spectra of non-algal particles can be modeled well by corresponding methods. A power function model was used to simulate the scattering spectra, which presented high predictive accuracies with MAPE values usually below 5% and RMSE values below 1.5 m -1 , while the spectral absorption model also performed well with mean S nap being 0.0052 nm -1 (standard deviation, SD =0.0010 nm -1 ). As to the phytoplankton absorption, a quadratic function model used was considered to have a good performance with corresponding parameters being supported at each wavelength in the spectral range of 400-700 nm. Additionally, two basic bio-optical parameters were determined, that is, b nap * (550) = 0.604 m 2 g -1 and a ph * (675) = 0.0288 m 2 mg -1 . Overall, these results obtained in the present study supply us with new knowledge about optical properties of suspended particulates in an inland and highly turbid lake (Lake Taihu), which are beneficial to the development of analytical models of water color remote sensing.

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“…Suspended particle concentrations (CL) were determined by the same procedure as for river samples. Since suspended matter in natural water consists of specific mixtures of different sizes and types of particles, calibration is required to determine CL based on in situ light transmission [Baker and Lavelle, 1984;Gordon et al, 1984;Hofmann and Dominik, 1995]. Light attenuation at 660 nm can unambiguously be related to particle concentrations assuming that the particle mixture is homogeneous and the attenuation by the water is constant [Boss et al, 2001].…”

Section: Particle Distributions In Downstream Lake Brienzmentioning

confidence: 99%

Effects of upstream hydropower operation on riverine particle transport and turbidity in downstream lakes

Finger

Schmid

Wüest

2006

Water Resources Research

131

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[1] Retention in upstream storage dams results in modified riverine water and particle discharge patterns. Particularly, suspended solids input and intrusion dynamics in downstream lakes are affected by dam operations. In a case study, size-dependent particle budgets for peri-alpine Lake Brienz (Switzerland), downstream of major hydropower installations, were determined for a recent 8-year period (1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)) and compared to hypothetical no-dam scenarios based on numerical simulations. For this purpose, current tributary particle loads, as well as lake-internal sedimentation and turbidity dynamics, were assessed with in situ measurements. The analysis shows that hydropower damming drastically diminishes particle fluxes and minimizes (short-term) peak discharges. Reductions of high-flow events substantially cut the number of deep intrusions increasing particle supply to the lake surface layer. Furthermore, these hydropower operations shift particle inputs from summer to winter. As a consequence, such peri-alpine lakes become more turbid during winter and less turbid during summer, influencing the seasonal light regime and subsequently the dynamics of phytoplankton growth.

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Turbidity and mass concentration of suspended matter in lake water: A comparison of two calibration methods

Cited by 24 publications

References 16 publications

Scattering spectrum properties and their relationship to biogeochemical parameters: a case study in Taihu Lake

Scattering spectrum properties and their relationship to biogeochemical parameters: a case study in Taihu Lake

Partitioning particulate scattering and absorption into contributions of phytoplankton and non-algal particles in winter in Lake Taihu (China)

Effects of upstream hydropower operation on riverine particle transport and turbidity in downstream lakes

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