Modification of River Tides by the Discharge

Godin, Gabriel

doi:10.1061/(asce)0733-950x(1985)111:2(257)

Cited by 111 publications

(115 citation statements)

References 1 publication

Supporting

Mentioning

105

Contrasting

Unclassified

Order By: Relevance

“…Since 1960s there has existed a long tradition of 1-D analytical solutions for tidal dynamics in estuaries (e.g., Dronkers, 1964;Ippen, 1966;Prandle and Rahman, 1980;Leblond, 1978;Godin, 1985Godin, , 1999Jay, 1991;Savenije, 1993b;Friedrichs and Aubrey, 1994;Lanzoni and Seminara, 1998;Kukulka and Jay, 2003;Horrevoets et al, 2004;Jay et al, 2011;Cai et al, 2012a). These analytical solutions usually made assumptions to simplify or linearize the nonlinear set of equations .…”

Section: Analytical Hybrid Modelmentioning

confidence: 99%

Analytical and numerical study of the salinity intrusion in the Sebou river estuary (Morocco) – effect of the “Super Blood Moon” (total lunar eclipse) of 2015

Haddout

Igouzal

Maslouhi

2016

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

Abstract. The longitudinal variation of salinity and the maximum salinity intrusion length in an alluvial estuary are important environmental concerns for policy makers and managers since they influence water quality, water utilization and agricultural development in estuarine environments and the potential use of water resources in general. The supermoon total lunar eclipse is a rare event. According to NASA, they have only occurred 5 times in the 1900s – in 1910, 1928, 1946, 1964 and 1982. After the 28 September 2015 total lunar eclipse, a Super Blood Moon eclipse will not recur before 8 October 2033. In this paper, for the first time, the impact of the combination of a supermoon and a total lunar eclipse on the salinity intrusion along an estuary is studied. The 28 September 2015 supermoon total lunar eclipse is the focus of this study and the Sebou river estuary (Morocco) is used as an application area. The Sebou estuary is an area with high agricultural potential, is becoming one of the most important industrial zones in Morocco and it is experiencing a salt intrusion problem. Hydrodynamic equations for tidal wave propagation coupled with the Savenije theory and a numerical salinity transport model (HEC-RAS software "Hydrologic Engineering Center River Analysis System") are applied to study the impact of the supermoon total lunar eclipse on the salinity intrusion. Intensive salinity measurements during this extreme event were recorded along the Sebou estuary. Measurements showed a modification of the shape of axial salinity profiles and a notable water elevation rise, compared with normal situations. The two optimization parameters (Van der Burgh's and dispersion coefficients) of the analytical model are estimated based on the Levenberg–Marquardt's algorithm (i.e., solving nonlinear least-squares problems). The salinity transport model was calibrated and validated using field data. The results show that the two models described very well the salt intrusion during the supermoon total lunar eclipse day. A good fit between computed salinity and measurements is obtained, as verified by statistical performance tests. These two models can give a rapid assessment of salinity distribution and consequently help to ensure the safety of the water supply, even during such infrequent astronomical phenomenon.

show abstract

Section: Analytical Hybrid Modelmentioning

confidence: 99%

Analytical and numerical study of the salinity intrusion in the Sebou river estuary (Morocco) – effect of the “Super Blood Moon” (total lunar eclipse) of 2015

Haddout

Igouzal

Maslouhi

2016

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

show abstract

“…The latter leads to earlier high-water and later lowwater intervals [Godin, 1985;Parker, 1991] Features that the theoretical model captures quite well are (1) the stronger dependence on input tidal forcing at low (rather than high) fiver flow levels; (2) the greater importance of incident tidal range at Wauna; (3) the effect of input tidal range on the flow level at which incipient current reversal occurs; and (4) the more rapid damping and greater phase delays that occur on spring tides (Figures 8 and 9 We expect wavelet techniques to prove invaluable to future studies of the nonlinear, time dependent dynamics of estuaries and coastal seas. In addition to improved analysis and prediction of estuarine tides and currents, likely applications include analysis of internal tides in fjords and over continental shelves, tides in ice-covered seas, storm surges, and tsunamis.…”

Section: Response Of the Tide To River Flow Variabilitymentioning

confidence: 99%

“…Little work has been carried out in the area of practical analysis and prediction of river tides, though several theoretical treatments of tidal-fluvial interactions are available [Dronkers, 1964;LeBlond, 1978;Godin, 1985Godin, , 1991Parker, 1991;Jay, 1991 b]. A lack of suitable data analysis and prediction methods has been a major obstacle.…”

Section: Nonstationary Tidal Processesmentioning

confidence: 99%

“…In carrying out these analyses, it is desirable to normalize for the effects of neap-spring and other long-period astronomical variability. This is most easily carried out using a complex admittance that compares properties at stations affected by river flow to those at an adjacent coastal station that is not so affected [Godin, 1985] The second caution is that the solutions developed here are approximations in several senses. Not only must the equations be partially linearized to obtain solutions, but the underlying nonstationary phenomena can only be represented by such an analysis as a sequence of solutions, each of which is appropriate to a stationary process at a perfectly defined frequency.…”

Section: Problem Settingmentioning

confidence: 99%

See 1 more Smart Citation

Interaction of fluctuating river flow with a barotropic tide: A demonstration of wavelet tidal analysis methods

Jay¹,

Flinchem²

1997

J. Geophys. Res.

145

149

View full text Add to dashboard Cite

“…Escoffier & Walton (1980) provided an analytic solution taking into account Q f without the / u t ∂ ∂ term. Godin (1985) found and expressed a relationship between the tide and the freshwater discharge by analysing the tidal records, but did not show a clear analytical solution. Vongvisessomjai & Rojanakamthorn (1989) utilised a perturbation method to solve analytically nonlinear the differential equation (2.10), but the application was still incomplete for natural rivers.…”

Section: ) and The Fourier Expansionmentioning

confidence: 92%

Aspects of inlet geometry and dynamics

Vu¹

View full text Add to dashboard Cite

This thesis contains new analytical approaches as well as laboratory-and field experiments conducted to understand the hydrodynamic and morphodynamic responses of tidal inlets to forcing from tides, river flow and waves on the time scales of closure, flood or storm events. The thesis outcome is effective new tools for authorities managing coastal zones balancing navigation-, shore protection-and socio-economic development purposes.A new method of coastal inlet classification based on dimensionless parameters is presented. These parameters represent the relative strength of the three main forcing agents: tides, river flow and waves. This new classification is applied to 178 inlets along the NSW coast of Australia, and compared with other widely used classification schemes available in the literature.The inlet hydraulic analysis is presented in Chapter 2 with given inlet geometry and wave climate with overwash discharge (Q over ) added into the usual governing equations. The hydraulic analysis of inlets in terms of the frequency response function for the linearised system is illustrated for cases of monochromatic and mixed diurnal/semi-diurnal tides. This analysis quantifies the influence of the entrance invert level, river flow and bay surface area. A case of inland flooding at Lake Conjola, Australia is used to test different methods resulting in a successful illustration of the importance of wave overwash as a driving force.For each hydrodynamic condition, the inlet system and its elements have a corresponding morphological equilibrium state. New relationships for inlets in equilibrium were constructed based on dimensional analysis and tested on a data set of 36 natural inlets in the USA. These new relations depend not only on the tidal prism but also the tidal period, and mean annual significant wave height s H .During unusual weather, the morphology of tidal inlets runs out of equilibrium.Subsequently, they may return to the previous equilibrium or move towards a new equilibrium or get closed. Inlet morphodynamics analysis is ideally carried out from topographical surveys. These are however costly and usually not available. Process based numerical models are still unreliable. A more economical and reliable new method, a 24.5hour moving window method, is introduced to infer hydraulic-and morpho-dynamic changes from tidal records. The morphological time scales are thus determined from time series of mean water levels, standard deviation, or the gain of the primary tidal components. This analytical method is successfully applied to inlet closure events and flood or storm events.The morphological time scale, T morph has been derived from the 24.5hour moving window analysis for many closure events with bay area (A b <0.7km 2 ) in Australia. The results show a clear trend of T morph decreasing with increasing relative wave strength -i.e., more rapid closure with iii bigger waves. However, for larger inlets or inlets with training works the morphology changes, at the time scale of individual storms, are usua...

show abstract

Modification of River Tides by the Discharge

Cited by 111 publications

References 1 publication

Analytical and numerical study of the salinity intrusion in the Sebou river estuary (Morocco) – effect of the “Super Blood Moon” (total lunar eclipse) of 2015

Analytical and numerical study of the salinity intrusion in the Sebou river estuary (Morocco) – effect of the “Super Blood Moon” (total lunar eclipse) of 2015

Interaction of fluctuating river flow with a barotropic tide: A demonstration of wavelet tidal analysis methods

Aspects of inlet geometry and dynamics

Contact Info

Product

Resources

About