National Assessment of Shoreline Change Part 3: Historical Shoreline Change and Associated Coastal Land Loss Along Sandy Shorelines of the California Coast

Hapke, Cheryl J.; Reid, David F.; Richmond, Bruce M.; Ruggiero, Peter; List, Jeffrey H.

doi:10.3133/ofr20061219

Cited by 115 publications

(115 citation statements)

References 27 publications

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“…At the time this shoreline was extracted, the uncertainty was estimated by considering two sources of error: Global Positioning System (GPS) position error, which was estimated to be ±1 m, and regression errors, which were estimated to be ±1.5 m (Hapke et al, 2006). These two terms were added in quadrature to get a bulk estimate of an uncertainty of 1.8 m.…”

Section: Contour Methodsmentioning

confidence: 99%

Comparing methods used by the U.S. Geological Survey Coastal and Marine Geology Program for deriving shoreline position from lidar data

Farris¹,

Weber²,

Doran³

et al. 2018

Open-File Report

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Section: Contour Methodsmentioning

confidence: 99%

Comparing methods used by the U.S. Geological Survey Coastal and Marine Geology Program for deriving shoreline position from lidar data

Farris¹,

Weber²,

Doran³

et al. 2018

Open-File Report

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“…El error de georreferenciación (E g ) se deriva del error de la raíz cuadrada media (RMS) obtenido durante la corrección geométrica de las imágenes, mientras que el error de digitalización (E d ) se estimó a partir de valores de otros estudios referenciados por Moore (2000). Siguiendo la metodología descrita por Hapke et al (2006), el error total en la posición de las líneas de costa (E lc ) se calculó mediante la raíz cuadrada de la suma de los cuadrados de los errores (Ecuación 1).…”

Section: Cálculo De Tasas De Erosión Y Acreción Litoralunclassified

El colapso ambiental en el rio Patia, Colombia: variaciones morfologicas y alteraciones en los ecosistemas de

Parra¹,

Ángel²

2014

lajar

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RESUMEN. El delta del Patía ha experimentado grandes variaciones morfológicas en las últimas cuatro décadas debido a presiones antrópicas. El transvase del río Patía al río Sanquianga, debido a la construcción del canal Naranjo en 1973, y la posterior formación del brazo Patianga, han derivado en complejas problemáticas ambientales que se evidencian en la reactivación del lóbulo norte del delta y el abandono de la anterior desembocadura en el lóbulo sur. En este artículo se analizan las principales alteraciones que se presentan en el delta del Patía como producto del desvío del río y las consecuentes variaciones en el aporte fluvial y de sedimentos. Estas alteraciones se reflejan en: (1) cambios drásticos en la línea de costa, con tasas de erosión de hasta 70 m año -1 ; (2) dulcificación de los estuarios del lóbulo norte del delta, cambio hidrológico que ha ocasionando la migración de la zona alta estuarina (salinidad <1) 15 km aguas abajo; y (3) alteraciones en la cobertura vegetal del Parque Nacional Natural Sanquianga, con incrementos en la vegetación de agua dulce de hasta 42%, y disminución en la cobertura de manglar de hasta 31% en un período de 15 años. Las condiciones actuales del delta del Patía son ejemplo de la importancia de las actividades humanas como agentes de cambio dentro de la evolución de los sistemas deltaicos, y revelan la necesidad de profundizar el estudio de este delta para establecer estrategias adecuadas de manejo y conservación. Palabras clave: río Patía, río Sanquianga, deltas tropicales, erosión costera, manglares, Pacífico colombiano.The environmental collapse in the Patía River, Colombia: morphological variations and impacts on mangrove ecosystems ABSTRACT. The Patía River delta has experienced major morphological variations in the last four decades due to anthropogenic pressures. The diversion of the Patía River to the Sanquianga River as a result of the construction of the Canal Naranjo in 1973, and the former development of the Patianga River, has generated complex environmental issues that are evidenced by the reactivation of the northern delta lobe and the abandonment of the previous river mouth in the southern lobe. This paper analyzes the main alterations taking place in the Patia delta as a result of the river diversion and the consequent variations in the water and sediment discharge. This alterations are reflected in: (1) drastic changes in coastline, with erosion rates up to 70 m y -1 ; (2) freshening conditions in the Sanguianga distributary channel, a hydrologic change that has shifted the upper estuarine region (salinity <1) 15 km downstream; and (3) alterations in the Sanquianga National Park land cover with increase in freshwater vegetation up to 42%, and decrease in mangrove cover up to 31% for a 15 years period. The current conditions of the Patía River delta are a clear example of the importance of human activities as change agents in the evolution of deltaic systems, and also reveal the need of deepen in the studies of this delta and establish appropriate manag...

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“…4), sitespecific, uniform values for Er 0 and C can be set using longterm field observations of cliff retreat (e.g. Hapke and Reid, 2007). Although the model does not explicitly model the smaller-scale structural variations that affect the retreat rate of the rock, such as joints and fractures (Clark and Johnson, 1995;Trenhaile et al, 1998;Dickson et al, 2004), the longterm cliff retreat rate allows for implicit representation (e.g.…”

Section: Modellingmentioning

confidence: 99%

Coastal vulnerability of a pinned, soft-cliff coastline – Part I: Assessing the natural sensitivity to wave climate

et al. 2014

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Abstract. The impact of future sea-level rise on coastal erosion as a result of a changing climate has been studied in detail over the past decade. The potential impact of a changing wave climate on erosion rates, however, is not typically considered. We explore the effect of changing wave climates on a pinned, soft-cliff, sandy coastline, using as an example the Holderness coast of East Yorkshire, UK.The initial phase of the study concentrates on calibrating a numerical model to recently measured erosion rates for the Holderness coast using an ensemble of geomorphological and shoreface parameters under an observed offshore wave climate. In the main phase of the study, wave climate data are perturbed gradually to assess their impact on coastal morphology. Forward-modelled simulations constrain the nature of the morphological response of the coast to changes in wave climate over the next century. Results indicate that changes to erosion rates over the next century will be spatially and temporally heterogeneous, with a variability of up to ±25 % in the erosion rate relative to projections under constant wave climate. The heterogeneity results from the current coastal morphology and the sediment transport dynamics consequent on differing wave climate regimes.

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National Assessment of Shoreline Change Part 3: Historical Shoreline Change and Associated Coastal Land Loss Along Sandy Shorelines of the California Coast

Cited by 115 publications

References 27 publications

Comparing methods used by the U.S. Geological Survey Coastal and Marine Geology Program for deriving shoreline position from lidar data

Comparing methods used by the U.S. Geological Survey Coastal and Marine Geology Program for deriving shoreline position from lidar data

El colapso ambiental en el rio Patia, Colombia: variaciones morfologicas y alteraciones en los ecosistemas de

Coastal vulnerability of a pinned, soft-cliff coastline – Part I: Assessing the natural sensitivity to wave climate

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