Coastal lagoons and their evolution: A hydromorphological perspective

Duck, R. W.; Silva, José Figueiredo da

doi:10.1016/j.ecss.2012.03.007

Cited by 110 publications

(47 citation statements)

References 42 publications

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“…Is established that geomorphology, hydrology, and sediment patterns of a coastal lagoon result from the interaction of the geological history, tides, wind, climate seasonality, shoreline, and ecological processes, as well as the balance in the physical and chemical variables. However, the effects of the catchments management and river or stream inputs are of prime importance mostly in choked lagoons (Kjerfve and Magill 1989;Bird 1994;Kjerfve 1994;Nichols and Boon 1994;Antonina-Galván et al 1999;Duck and da Silva 2012;Pasquini et al 2012;Adlam 2014).…”

Section: Discussionmentioning

confidence: 99%

“…They are also areas exhibiting high overall productivity (Kjerfve 1994;McLusky and Elliott 2004). The existence of these ephemeral ecosystems depends on their filtering capacity as well as relative changes in sea level due to global climate change, plate tectonics, and anthropogenic activities along the catchments and adjacent areas (Kjerfve 1986;Kjerfve and Magill 1989;Duck and da Silva 2012;Rodrigues et al 2012).…”

Section: Introductionmentioning

confidence: 97%

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A bathymetric study to support management plans for La Caimanera coastal lagoon, Gulf of Morrosquillo, Colombia

Delgadillo-G¹,

Ruíz-A

2016

J Coast Conserv

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There are large extensions of coastal lagoons in the Colombian Caribbean. In spite of their renowned environmental and socio-economic importance, these ecosystems have been poorly evaluated. To initiate a process for understanding the biophysical features of the La Caimanera lagoon, bathymetric surveys were conducted on a 25 × 25 m grid approach. Echo sounder and GPS were used to collect the data, which was then analyzed with ArcGIS 9.2 to produce bathymetry maps. A total of 3355 data points indicated an average depth of 1.83 m (SD ± 0.55) with a range of 0.7-5.4 m. Higher and lower values were recorded within the access channel and on the western margin of the lagoon respectively, suggesting that depth distribution was probably related to the interaction of different factors. These factors include the hydrological influence of the entrance channel currents and the microcatchments of the streams located on the southeast side, along with the possible effects of the survey course selection. Apparently, the dynamic of the streams caused sedimentation on the opposite southwest margin, affecting the environmental quality by siltation and the accumulation of organic matter. Research, monitoring programs, and new management plans are necessary to avoid the deterioration of the ecological goods and services derived from this important local ecosystem.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

A bathymetric study to support management plans for La Caimanera coastal lagoon, Gulf of Morrosquillo, Colombia

Delgadillo-G¹,

Ruíz-A

2016

J Coast Conserv

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“…Only in few cases, i.e. Aveiro Lagoon (Duck and da Silva, 2012), Venice Lagoon (Molinaroli et al, 2007;Sarretta et al, 2010) and San Pablo Bay (Jaffe et al, Published by Copernicus Publications on behalf of the European Geosciences Union.…”

Section: Introductionmentioning

confidence: 99%

Assessing hydrological effects of human interventions on coastal systems: numerical applications to the Venice Lagoon

Ferrarin

Ghezzo

Umgiesser

et al. 2013

Hydrol. Earth Syst. Sci.

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Abstract. The hydrological consequences of historical, contemporary and future human activities on a coastal system were investigated by means of numerical models. The changes in the morphology of the Lagoon of Venice during the last century result from the sedimentological response to the combined effects of human interventions on the environment and global changes. This study focuses on changes from 1927 to 2012 and includes the changes planned for the protection of the city of Venice from storm surges and exceptional tides under future sea level rise scenarios. The application of a hydrodynamic model allowed for the analysis of the morphological effects on the lagoon circulation, the interaction with the sea and the internal mixing processes. The absolute values of the exchange between the lagoon and sea increased from 1927 to 2002 (from 3900 to 4600 m 3 s −1 ), while the daily fraction of lagoon water volume exchanged decreased. At the same time, the flattening of the lagoon and loss of morphological heterogeneity enhanced the internal mixing processes driven by the tide and wind, reducing thus the overall water renewal time from 11.9 days in 1927 to 10.8 days in 2002. Morphological changes during the last decade reduced the water exchange through the inlets and induced an increase of the basin-wide water renewal time of 0.5 day. In the future, Venice Lagoon will evolve to a more restricted environment due to sea level rise, which increases the lagoon volume, and periodical closure of the lagoon from the sea during flooding events, which reduces the communication with the open sea. Therefore, the flushing capacity of the lagoon will decrease considerably, especially in its central part. Furthermore, some considerations on the impact of the hydromorphological changes on the ecological dynamics are proposed.

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“…A significant example is the case of Aveiro Lagoon in Portugal, where 2 centuries of channelization, jetty breakwater construction, and dredging have led to a progressive shift from the original fluvially dominated system into the present tidally dominated one. The associated stresses imposed by increased tidal currents have led to important changes in the sedimentary regime (Duck and da Silva, 2012).…”

Section: Introductionmentioning

confidence: 99%

Hydrogeological effects of dredging navigable canals through lagoon shallows. A case study in Venice

Teatini

Isotton²,

Nardean

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. For the first time a comprehensive investigation has been carried out to quantify the possible effects of dredging a navigable canal on the hydrogeological system underlying a coastal lagoon. The study is focused on the Venice Lagoon, Italy, where the port authority is planning to open a new 10 m deep and 3 km long canal to connect the city passenger terminal to the central lagoon inlet, thus avoiding the passage of large cruise ships through the historic center of Venice. A modeling study has been developed to evaluate the short (minutes), medium (months), and long (decades) term processes of water and pollutant exchange between the shallow aquifer system and the lagoon, possibly enhanced by the canal excavation, and ship wakes. An in-depth characterization of the lagoon subsurface along the channel has supported the numerical modeling. Piezometer and sea level records, geophysical acquisitions, laboratory analyses of groundwater and sediment samples (chemical analyses and ecotoxicity testing), and the outcome of 3-D hydrodynamic and computational fluid dynamic (CFD) models have been used to set up and calibrate the subsurface multi-model approach. The numerical outcomes allow us to quantify the groundwater volume and estimate the mass of anthropogenic contaminants (As, Cd, Cu, Cr, Hg, Pb, Se) likely leaked from the nearby industrial area over the past decades, and released into the lagoon from the canal bed by the action of depression waves generated by ships. Moreover, the model outcomes help to understand the effect of the hydrogeological layering on the propagation of the tidal fluctuation and salt concentration into the shallow brackish aquifers underlying the lagoon bottom.

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Coastal lagoons and their evolution: A hydromorphological perspective

Cited by 110 publications

References 42 publications

A bathymetric study to support management plans for La Caimanera coastal lagoon, Gulf of Morrosquillo, Colombia

A bathymetric study to support management plans for La Caimanera coastal lagoon, Gulf of Morrosquillo, Colombia

Assessing hydrological effects of human interventions on coastal systems: numerical applications to the Venice Lagoon

Hydrogeological effects of dredging navigable canals through lagoon shallows. A case study in Venice

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