Characterizing the vertical diffuse attenuation coefficient for downwelling irradiance in coastal waters: Implications for water penetration by high resolution satellite data

Mishra, Deepak R.; Narumalani, Sunil; Rundquist, Donald C.; Lawson, Merlin P.

doi:10.1016/j.isprsjprs.2005.09.003

Cited by 105 publications

(82 citation statements)

References 17 publications

(19 reference statements)

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“…From the simulated Kd results, with the assumption that 90% of the diffuse light comes from a water column of depth of 1/Kd [85], MODIS band 1 can only penetrate 1.9 m at a TSS concentration of 3.9 mg/L for even very low CHL and CDOM. For high CHL and CDOM concentrations, the penetration depth of MODIS band 1 is only 1.5 m even for zero TSS.…”

Section: Conflicts Of Interestmentioning

confidence: 99%

A Semi-Analytic Model for Estimating Total Suspended Sediment Concentration in Turbid Coastal Waters of Northern Western Australia Using MODIS-Aqua 250 m Data

2016

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Abstract:Knowledge of the concentration of total suspended sediment (TSS) in coastal waters is of significance to marine environmental monitoring agencies to determine the turbidity of water that serve as a proxy to estimate the availability of light at depth for benthic habitats. TSS models applicable to data collected by satellite sensors can be used to determine TSS with reasonable accuracy and of adequate spatial and temporal resolution to be of use for coastal water quality monitoring. Thus, a study is presented here where we develop a semi-analytic sediment model (SASM) applicable to any sensor with red and near infrared (NIR) bands. The calibration and validation of the SASM using bootstrap and cross-validation methods showed that the SASM applied to Moderate Resolution Imaging Spectroradiometer (MODIS)-Aqua band 1 data retrieved TSS with a root mean square error (RMSE) and mean averaged relative error (MARE) of 5.75 mg/L and 33.33% respectively. The application of the SASM over our study region using MODIS-Aqua band 1 data showed that the SASM can be used to monitor the on-going, post and pre-dredging activities and identify daily TSS anomalies that are caused by natural and anthropogenic processes in coastal waters of northern Western Australia.

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Section: Conflicts Of Interestmentioning

confidence: 99%

A Semi-Analytic Model for Estimating Total Suspended Sediment Concentration in Turbid Coastal Waters of Northern Western Australia Using MODIS-Aqua 250 m Data

2016

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“…1). K d has been found to depend primarily upon TSS in flowing fresh water bodies; and thus, K d provides a surrogate for TSS, although it is recognized that a number of secondary variables can also significantly impact K d (Kirk 1994;Davies-Colley and Smith 2001;Squires and Lesack 2003;Mishra et al 2005;Davies-Colley and Nagels 2008;Julian et al 2008a). The LASS's measuring volume can be approximated for clear water using Snell's law of refraction.…”

Section: Description Of Lassmentioning

confidence: 99%

Estimating Suspended Sediment Concentration in Streams by Diffuse Light Attenuation

2014

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A light attenuation sensor system (LASS) for measurements in waters is described in this paper. The LASS records irradiance at multiple levels in the water column to provide a measure of the diffuse light attenuation coefficient which is strongly affected by suspended sediment. Dimensional analysis and geometric optical theory are used to relate the irradiance attenuation to sediment properties through a dimensionless product. The latter is termed as a light attenuation number for suspended sediment in waters. The LASS and dimensional analysis results are validated in the laboratory using fluvial sediments collected from a third-order stream and monodisperse quartz sediment. The attenuation coefficient estimated with LASS data varied nonlinearly with total suspended sediment concentration due to particle shadowing and multiple scattering at large optical depths. The light attenuation coefficient for each sediment type is well described as a function of total suspended sediment concentration by empirical power law relationships, which provides confidence in the functioning of LASS. Light attenuation curves for different sediment types collapsed onto a single curve when replotted according to dimensionless numbers arising from the dimensional analysis, which confers confidence in the analysis for future research and application. A successful field demonstration of LASS in a small stream highlights its potential application in hydraulic and ecological research as well as future avenues of research to improve the sensor.

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“…Remote sensing of the seagrass growing in sea bed, respect to terrestrial applications for vegetation monitoring, shows additional limiting factors concerning the perturbing effects introduced by coastal water column to reflectance/radiance R bi useful signals [20,24] coming from vegetation in sea bottom and acquired by remote sensors. The water column not only attenuates these useful reflectance signals but introduces also its own specific spectral components dependent on the concentration of the optically actives constituents and on its depth [26,27].…”

Section: Preprocessing Daedalus Atm Multispectral Datamentioning

confidence: 99%

Mapping Spatial Patterns of Posidonia oceanica Meadows by Means of Daedalus ATM Airborne Sensor in the Coastal Area of Civitavecchia (Central Tyrrhenian Sea, Italy)

et al. 2013

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Abstract:The spatial distribution of sea bed covers and seagrass in coastal waters is of key importance in monitoring and managing Mediterranean shallow water environments often subject to both increasing anthropogenic impacts and climate change effects. In this context we present a methodology for effective monitoring and mapping of Posidonia oceanica (PO) meadows in turbid waters using remote sensing techniques tested by means of LAI (Leaf Area Index) point sea truth measurements. Preliminary results using Daedalus airborne sensor are reported referring to the PO meadows at Civitavecchia site (central Tyrrhenian sea) where vessel traffic due to presence of important harbors and huge power plant represent strong impact factors. This coastal area, 100 km far from Rome 4878(Central Italy), is characterized also by significant hydrodynamic variations and other anthropogenic factors that affect the health of seagrass meadows with frequent turbidity and suspended sediments in the water column. During 2011-2012 years point measurements of several parameters related to PO meadows phenology were acquired on various stations distributed along 20 km of coast between the Civitavecchia and S. Marinella sites. The Daedalus airborne sensor multispectral data were preprocessed with the support of satellite (MERIS) derived water quality parameters to obtain here improved thematic maps of the local PO distribution. Their thematic accuracy was then evaluated as agreement (R 2 ) with the point sea truth measurements and regressive modeling using an on purpose developd method.

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Characterizing the vertical diffuse attenuation coefficient for downwelling irradiance in coastal waters: Implications for water penetration by high resolution satellite data

Cited by 105 publications

References 17 publications

A Semi-Analytic Model for Estimating Total Suspended Sediment Concentration in Turbid Coastal Waters of Northern Western Australia Using MODIS-Aqua 250 m Data

A Semi-Analytic Model for Estimating Total Suspended Sediment Concentration in Turbid Coastal Waters of Northern Western Australia Using MODIS-Aqua 250 m Data

Estimating Suspended Sediment Concentration in Streams by Diffuse Light Attenuation

Mapping Spatial Patterns of Posidonia oceanica Meadows by Means of Daedalus ATM Airborne Sensor in the Coastal Area of Civitavecchia (Central Tyrrhenian Sea, Italy)

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