Fundamental concepts of exchange and transport time scales in a coastal sea

Takeoka, Hidetaka

doi:10.1016/0278-4343(84)90014-1

Cited by 340 publications

(192 citation statements)

References 4 publications

Supporting

Mentioning

190

Contrasting

Unclassified

Order By: Relevance

“…Of these, residence time (REST) may be considered as a first-order description of the transport process (Monsen et al, 2002) and is generally defined as the time required for the total mass of a conservative tracer originally within the whole or a segment of the water body to be reduced to a factor of 1/e (Takeoka, 1984a(Takeoka, , 1984bSanford et al, 1992;Luketina, 1998;Wang et al, 2004). The REST, thus defined, represents a property of a specific location within the water body which describes the proper transport time scale for the physical process in question.…”

Section: Residence Timesmentioning

confidence: 99%

See 1 more Smart Citation

Links between hydrology and sedimentology in the Lagoon of Venice, Italy

Molinaroli

Guerzoni

Sarretta

et al. 2007

Journal of Marine Systems

View full text Add to dashboard Cite

A textural classification of sediments collected in input channels, shallow lagoon beds and navigation channels of the Lagoon of Venice is presented. Some variables describing both the hydrodynamics and the transport time scales of the Lagoon are compared with bottom sediment distribution inside the basin. A high correlation between residence time (REST) and the silt fraction (4-31 µm) was only found for REST values < 20 days. A good correlation was also found between root mean square velocity (RMSV) and the fine sand fraction (63-105 µm) for RSMV > 10 cms -1 . The distribution of the various sediment types was explained by the use of PCA applied to both grain-size and hydrological parameters, which extracted two principal factors and formed four groups of clustered samples. Groups 1 (clayey silt) and 2 (very silty slightly sandy mud) comprise samples located mainly in the northern and central lagoon and inshore. The samples of group 3 (very silty sandy mud) seem to show stabilisation, reflected in the reduction of sand and the sedimentation of silt with respect to samples in group 4 (slightly silty sand), some of which were collected on a previous seagrass bed which has now disappeared and/or been reduced in size.

show abstract

Section: Residence Timesmentioning

confidence: 99%

“…To compute it, we refer to the mathematical expression of Takeoka (1984aTakeoka ( , 1984b known as the remnant function. The water REST was computed for each element of the grid domain when only tide forces the basin and tidal return flow effects are prevented.…”

Section: Residence Timesmentioning

confidence: 99%

Links between hydrology and sedimentology in the Lagoon of Venice, Italy

Molinaroli

Guerzoni

Sarretta

et al. 2007

Journal of Marine Systems

View full text Add to dashboard Cite

show abstract

“…Takeoka (1984) introduced the residence time analogous to the definition of age and transit time. Deleersnijder et al (2001) demonstrated the potential of age as a tool for under- To analyze the transport processes in the Dez reservoir, the CE-QUAL-W2 model (Cole & Wells 2002), a two-dimensional laterally averaged model, was used.…”

Section: Abdelrhman 2005mentioning

confidence: 99%

On the estimation of transport timescales – case study: the Dez reservoir

Hasanloo

Etemad‐Shahidi

2010

Journal of Hydroinformatics

View full text Add to dashboard Cite

The purpose of this study is to demonstrate an application of a hydroinformatics methodology for analysis of transport timescales in a large reservoir. Therefore, a laterally averaged two-dimensional numerical model was used to estimate the transit time, flushing times and combination of these two timescales by modeling about 230 scenarios in the Dez reservoir.The model was calibrated using temperature profiles and then executed for a period of two years (2002)(2003)(2004). A possible characterization of the flushing time as e-folding time was investigated and the results revealed that the e-folding time, which is simpler to estimate, can be used in place of the flushing time in the Dez reservoir. The effects of the location of the outlet on each of these timescales were also investigated. Results indicated that the mean residence and flushing times have their smallest value when the outlet is set in the middle of the Dez dam. The mean flushing times were also less sensitive to thermal structures of the Dez reservoir than the transit times. Finally, the temporal patterns of these timescales were elucidated. It was found that no single transport timescale can be used for all conditions.

show abstract

“…The annual cycle, exhibiting seasonal oscillations, is reasonably well reproduced from one year to another. developed by Takeoka (1984) and utilized by Murakami (1991). The average residence time (τ ) is calculated by fitting a remnant function representing an exponential distribution to the actual Tc-99 decay curve using the least square method and integration over a time range from 0 to infinity.…”

Section: Hydrography and Circulation Of Tc-99 Within The Irish Seamentioning

confidence: 99%