Estuarine Hydrography

Pritchard, Donald W.

doi:10.1016/s0065-2687(08)60208-3

Cited by 145 publications

(79 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1,2 It is acknowledged that mixing in natural waterways is a turbulent process, but predictions of contaminant dispersion in estuaries are highly sensitive to specific features of the natural system and must rely on exhaustive field data for accurate calibration and validation. 3,4 One reason for the minimal coverage of this problem in the literature is the very complex variations of hydrodynamic and physio-chemical properties with tidal phase.…”

Section: Introductionmentioning

confidence: 99%

Spatial variation in physio-chemistry in a small river estuary

Chanson¹,

Ramsay²

2008

Proceedings of the Institution of Civil Engineers - Water Manag

View full text Add to dashboard Cite

Understanding of riverine and estuarine mixing processes remains limited, and predictions are highly sensitive to specific features of natural systems. One reason for this is the very complex variations of hydrodynamic and physiochemical properties with the tidal phase. This study presents the results of two field works during which a range of flow and chemical parameters were recorded simultaneously at several locations along a small subtropical estuary. The studies were conducted in contrasting (wet and dry) conditions. Field measurements indicated that the hydrodynamics and water conductivity were dominated by tidal forcing and, to a lesser extent, by freshwater inputs. There were generally significantly greater differences between longitudinal sites than between vertical depths, although some marked differences were observed between the upper and lower estuarine zones. The comparative results between wet and dry field studies illustrated some marked stratification in wet weather along the whole of the estuary, implying that the surface samples were not representative of the average water column properties. Overall, the complexity of the hydrodynamics and water quality has some impact on water quality modelling of the system.

show abstract

Section: Introductionmentioning

confidence: 99%

Spatial variation in physio-chemistry in a small river estuary

Chanson¹,

Ramsay²

2008

Proceedings of the Institution of Civil Engineers - Water Manag

View full text Add to dashboard Cite

show abstract

“…The studies cited above were conducted in estuaries where freshwater input results in significant non-tidal residual flows and a net flux of water from the bay (partially mixed estuary) (Pritchard 1952, Dyer 1997. San Diego Bay (SDB) is representative of 'low-inflow estuaries' (LIE), where freshwater input is negligible or absent for extended periods of time (Largier et al 1996(Largier et al , 1997.…”

Section: Introductionmentioning

confidence: 99%

Vertical migration behavior and horizontal distribution of brachyuran larvae in a low-inflow estuary: implications for bay-ocean exchange

DiBacco

Sutton²,

McConnico³

2001

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Rhythmic vertical migration has been well documented as a behavioral mechanism of brachyuran larvae that are actively exported from or retained within estuaries with net tidal residual flows, such as partially mixed estuaries. However, the effectiveness of vertical migratory behavior in mediating net larval transport in a low-inflow estuary (LIE), which is characterized by little or no freshwater inflow for extended periods of time, has not been addressed. Larval transport hypotheses, developed using a validated hydrodynamic model of San Diego Bay (SDB; an LIE), predicted that vertical migratory behavior was necessary to transport larvae out of the bay, while larvae lacking vertical migratory behavior would be retained within the bay. These predictions were tested in a field study that examined the temporal and spatial (vertical and horizontal) distribution of 2 brachyuran families, Pachygrapsus crassipes (Grapsidae) and Lophopanopeus spp. (Panopeidae), sampled at 2 sites within SDB. P. crassipes zoeae exhibited vertical migratory behavior, which enhanced their net export from the bay. Stage I P. crassipes zoeae were concentrated in surface layers (0 to 2 m) during nocturnal ebb tides, but exploited low-velocity conditions associated with the benthic-boundary layer, which retarded transport back into the bay during flood tide. The lack of Post-Stage I P. crassipes zoeae within SDB suggests that the observed vertical migratory behavior was an effective means for exiting the bay. Stage I and Post-Stage I Lophopanopeus spp. larvae were sampled within SDB, but exhibited no clear rhythmic migration patterns. The lack of vertical migratory behavior and the presence of all larval stages of development suggest that Lophopanopeus spp. larvae were retained within the bay throughout meroplanktonic development. Heterogeneous horizontal distributions of Stage I P. crassipes and Lophopanopeus spp. zoeae reflect hatching sites and physical circulation features which concentrate larvae at specific areas. Differences in larval behavior observed for grapsid and panopeid larvae in SDB had a significant effect on their dispersal and retention.KEY WORDS: Larval behavior · Selective tidal stream transport · Low-inflow estuary · Vertical migration · Zoeae · Larvae · Numerical simulations · San Diego Bay · Pachygrapsus crassipes · Lophopanopeus spp. 217: 191-206, 2001 they develop prior to reentering estuaries and recruiting to adult populations (Christy 1982). The coupling of vertical migration by larvae with differential horizontal advection associated with tidal phase, termed selective tidal stream transport, can mediate the horizontal distribution and dispersal of planktonic larvae (Epifanio 1988, McConaugha 1988. Bousfield (1955) recognized that vertical movements out of seaward-moving water layers could facilitate larval retention within an estuary. Vertical migratory behavior has been well documented in decapod larvae (recent studies include Paula 1989, Queiroga et al. 1994, 1997, Lochmann et al. 1995, Rodriguez et ...

show abstract

“…115 Alfacs Bay is defined as a bar-build estuary (Pritchard, 1952) formed by the interaction of Ebro River 116 sediment and currents (Fig.1). The bay is around 16km in length by 4km wide, with an average depth 117 of around 4m.…”

Section: --Study Areamentioning

confidence: 99%