Preface

Dera, Jerzy

doi:10.1016/s0422-9894(08)71300-x

Cited by 21 publications

(25 citation statements)

References 0 publications

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“…As is known (Bricaud et al 1981;Baker and Smith 1982;Dera 1992;Maekivi and Arst 1996), the amount of yellow substance in the water (in mg . L-' or g .…”

Section: Remote Sensing Measurements (Aboard a Boat)mentioning

confidence: 93%

Optical investigations of Estonian and Finnish lakes

Arst¹,

Mäekivi²,

Kutser³

et al. 1996

Lakes & Reservoirs

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Sixteen lakes in Estonia and five lakes in Finland were investigated during 1992-95, using mainly optical methods. A total of 14 expeditions were undertaken, but the number was different for each lake. Vertical profiles of solar irradiance (spectral and integral), temperature and dissolved oxygen in the water column were measured, and Secchi disk depths were determined. Chlorophyll a and suspended matter concentrations were determined in the laboratory from water samples. Spectrophotometrical processing of the water samples (unfiltered and filtered water) was carried out to describe the beam attenuation coefficient spectra and to determine the spectral influence of yellow substance in the water. Passive optical remote sensing measurements were made from on board a boat. The data obtained show a rather high variability in water characteristics, although the lakes investigated are situated in the same climatic region. Several lakes receive human impact, and this has led to a decrease in water transparency and an increase in eutrophication. Despite rather low values for attenuation depth in lakes, water quality can be estimated using optical remote sensing data. Key wordslake optics, optical properties of water, optically active substances in water, underwater light climate.

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“…As is known (Bricaud et al 1981;Baker and Smith 1982;Dera 1992;Maekivi and Arst 1996), the amount of yellow substance in the water (in mg . L-' or g .…”

Section: Remote Sensing Measurements (Aboard a Boat)mentioning

confidence: 93%

Optical investigations of Estonian and Finnish lakes

Arst¹,

Mäekivi²,

Kutser³

et al. 1996

Lakes & Reservoirs

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“…The theoretical basis of the light measurements is thoroughly discussed in [ [16][17][18]. The optical parameter, best used to describe the worsening of light conditions due to sediment resuspension, is the diffuse attenuation coefficient d K (PAR), calculated from the underwater irradiation data as…”

Section: Optical Measurements and Quantification Of Wake Impactmentioning

confidence: 99%

Monitoring wave-induced sediment resuspension

Erm¹,

Alari²,

Listak³

2009

Estonian J. Eng.

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The objective of this paper is to quantify resuspension and bed load transport of bottom sediments, induced by fast ferry wakes and wind waves near Aegna jetty, Tallinn Bay, using in situ measurements of waves, resuspension and optical properties of sea water. A new autonomous experimental set of two PAR-sensors, anchored into the sea bed, was used to measure the underwater irradiation. Wakes usually caused a rapid increase of the optical density of sea water by up to 50% from its background value. The total impact of fast ferry waves in terms of resuspended sediment concentration has not been substantially reduced compared to measurements in the past. However, wind waves apparently are the main driving force for both sediment resuspension and transport in 3 m deep water.

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“…The absorption coefficient of water a, is determined in the simplest case, when the absorption of light within the analyzed range of wavelengths is so great that scattering can be neglected [7]. The absorption coefficient [1] can be expressed by…”

Section: Mul Tispectral Absorption Algorithmmentioning

confidence: 99%

“…Water constituents can be mapped quantitatively by the use of multi or hyper-spectral sensors, if the inherent optical properties (lOPs) of dominant water constituents are known [1]. Waters and soils in the environment such as seas, rivers, lakes and are very important for the life of human beings.…”

mentioning

confidence: 99%