Secchi Disc Relationships1

French, Richard H.; Cooper, James J.; Vigg, Steven

doi:10.1111/j.1752-1688.1982.tb04538.x

Cited by 28 publications

(15 citation statements)

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“…Por eso, el producto K d •SD no resulta ser un valor generalizable como se pretendió históricamente. El primer valor que se propuso fue de 1.7 (Poole y Atkins, 1929), posteriormente 1.44 (Holmes, 1970) y más tarde 1.16 (French et al, 1982). Como se puede apreciar en la Tabla 2, en nuestro caso, el valor de K d •SD en cada embalse varia ente 0.82 y 2.16, rango que supera ampliamente los valores propuestos.…”

Section: Discusión Transparencia Y Zona Fóticaunclassified

“…La dispersión y absorción de la luz debida a los componentes en suspensión y la absorción debida a los componentes disueltos pueden afectar de forma diferente a SD y K d . Así, aunque se han tratado de establecer equivalencias generales entre SD y K d (Poole y Atkins, 1929;Holmes, 1970;French et al, 1982) la variabilidad de los componentes disueltos y en suspensión en distintos cuerpos de agua, incluso dentro de una misma región geográfica, no han permitido validar los valores propuestos para el producto de K d •SD que, de ser constante, validaría la hipótesis de ser parámetros inversamente proporcionales. Sin embargo, debido a la simplicidad de las medidas con el disco de Secchi, aún se siguen usando como aproximaciones en algunos estudios (Tundisi y Tundisi, 2011;Rodríguez, 2016).…”

Section: Introductionunclassified

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Atenuación de luz en embalses del sur-este de la Península Ibérica

2019

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Este trabajo estudia de forma pareada los valores del coeficiente de extinción vertical de la luz (Kd) y de la profundidad de visión del disco de Secchi (SD) en un conjunto de 12 embalses del sureste de la Península Ibérica que difieren en sus características de paisaje, físicas, químicas y tróficas. Se analizan las relaciones encontradas para evaluar la utilidad del SD como predictor de la zona fótica (Zeu) calculada mediante Kd y se propone la expresión Zeu(m) ≈ 2·SD (m)+6 como una mejor estima de la zona fótica en estos embalses. Además se investiga la influencia de la clorofila-a, turbidez y carbono orgánico disuelto (DOC) sobre la transparencia del agua de los embalses. Tanto la concentración de DOC como la turbidez afectan a dichas propiedades. Finalmente, se analiza la capacidad de SD como predictor de Kd.

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Section: Discusión Transparencia Y Zona Fóticaunclassified

Section: Introductionunclassified

Atenuación de luz en embalses del sur-este de la Península Ibérica

2019

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“…out replacement; therefore, there was an artificially caused head difference between the water isolated in the microcosms and the reservoir, in situ measurements for temperature, pH, specific conductance, and dissolved oxygen were made at 1.0 m intervals to the bottom of each microcosm with a Hydrolab System 8000 on a daily basis. Light penetration measurements were made in all microcosms with a secchi disc, and the measured secchi disc depths were converted to euphotic zone depths using the results presented previously by French, et al (1982). Additional details regarding the sampling and analysis procedures are contained in Cooper and Vigg (1983).…”

Section: Microcosm Design and Samplingmentioning

confidence: 99%

“…Light Penetration as Measured by Secchi Disc and Converted to Euphotic Depth UsingFrench, et al (1982), Conversion Equation.…”

mentioning

confidence: 99%

USE OF IN SITU MICROCOSMS FOR EVALUATING RESERVOIR WATER MANAGEMENT OPTIONS¹

French

Cooper

Vigg

1988

J American Water Resour Assoc

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The use of in situ microcosms for performing reservoir trophic studies and aiding in the design of reservoir restoration programs are discussed. The site of this study was Lahontan Reservoir, Nevada, which has experienced water quality problems associated with monospecific blooms of blue‐green algae and hypolimnetic dissolved oxygen depletions. In situ microcosms were used to investigate the response of phytoplankton species composition to additions of the nutrients nitrogen, phosphorus, and the phosphorus precipitant aluminum sulfate. At the end of the 16‐day experimental period, the microcosms receiving the phosphate treatments yielded the highest standing crops of algae and the greatest percentage composition of blue‐green algae. The microcosms receiving the nitrate treatment exhibited greater initial algal concentrations followed by a decline in photoplankton, which coincided with an increase in the zoo‐plankton population. The results presented here suggest that microcosms can be a cost‐effective method for assessing reservoir water quality and planning restoration programs.

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“…Maximum depth (z max ) and Secchi disk transparency (z sd ) depth were also measured. The depths of euphotic zone (z eu ) were calculated from the Secchi disk disappearance depths (z eu = z sd ×1.88), according to French et al (1982).…”

Section: Study Areamentioning

confidence: 99%

Morphometry and retention time as forcing functions to establishment and maintenance of aquatic macrophytes in a tropical reservoir

2016

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Macrophytes may constitute an important resource for several chemical, physical and biological processes within aquatic ecosystems. This study considers that in tropical reservoirs with low retention time and with low values of shoreline development (D L ), the expansion and persistence of aquatic macrophytes are mainly reported to local conditions (e.g., hydrodynamic and wind exposure) rather than trophic status and depth of the euphotic zone. In this context, this study aimed at describing and comparing the incidence of aquatic macrophytes in a throughflowing, non-dendritic tropical reservoir. During February 2006 to November 2007, eight limnological surveys were performed quarterly within the Ourinhos Reservoir, and in the mouth areas of its tributaries. At the six sampling stations 30 variables were measured. The number of sites with plants varied between 21 and 38 and at the end of the 1 st year the total richness was found. The sampling survey outcome the recognition of 18 species of aquatic macrophytes; Cyperaceae (2 genera and 1 species), Pontederiaceae (3 species) and Onarograceae (3 genera) were the families with higher diversity. Seven species (Typha domingensis Pers., Myriophyllum aquaticum (Vell.) Verdec, Salvinia auriculata Aubl., Eichhornia azurea (Sw.) Kunth, Eleocharis sp1, Eichhornia crassipes (Mart.) Solms, Oxycaryum cubense (Poepp. & Kunth) Lye) always were present and were more frequent in the sites. The occurrence of emergent species predominated (45.9%), followed by submersed rooted (24.5%), free floating (19.5%), floating rooted (9.7%) and free submersed (0.3%). Although limnological variables and the distribution of macrophytes have discriminated the same sampling points, the stepwise multiple linear regressions did not pointed out strong correspondences (or coherence) among the most constant and distributed macrophyte species and the selected limnological variables, as well the trophic statuses. Seeing the low relationship among limnological variables and macrophytes distribution, in the case of Ourinhos Reservoir, the results pointed out that the water turbulence, low D L and wind exposure are the main driving forces that determine its aquatic plant distribution, life forms and species composition.Keywords: aquatic plants, biodiversity, population dynamic, drive functions, limnological constrains, Paranapanema River, Ourinhos HPP. Morfometria e tempo de residência como fatores determinantes noestabelecimento e manutenção de macrófitas aquáticas em um reservatório tropical ResumoAs macrófitas podem constituir um recurso importante para vários processos físicos, químicos e biológicos dos ecossistemas aquáticos. Esse estudo considera que nos reservatórios tropicais com baixo tempo de retenção e com baixos valores do grau de desenvolvimento das margens (D L ), a expansão e manutenção das macrófitas aquáticas são referidas principalmente às condições locais (e.g., hidrodinâmica e exposição ao vento), ao invés do estado trófico e da profundidade de zona eufótica. Nesse contexto, o pr...

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Secchi Disc Relationships¹

Cited by 28 publications

References 0 publications

Atenuación de luz en embalses del sur-este de la Península Ibérica

Atenuación de luz en embalses del sur-este de la Península Ibérica

USE OF IN SITU MICROCOSMS FOR EVALUATING RESERVOIR WATER MANAGEMENT OPTIONS¹

Morphometry and retention time as forcing functions to establishment and maintenance of aquatic macrophytes in a tropical reservoir

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Secchi Disc Relationships1

Cited by 28 publications

References 0 publications

Atenuación de luz en embalses del sur-este de la Península Ibérica

Atenuación de luz en embalses del sur-este de la Península Ibérica

USE OF IN SITU MICROCOSMS FOR EVALUATING RESERVOIR WATER MANAGEMENT OPTIONS1

Morphometry and retention time as forcing functions to establishment and maintenance of aquatic macrophytes in a tropical reservoir

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Product

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Secchi Disc Relationships¹

USE OF IN SITU MICROCOSMS FOR EVALUATING RESERVOIR WATER MANAGEMENT OPTIONS¹