Solr Search · GéoProdig, portail d'information géographique

Sensitivity of post-hurricane beach and dune recovery to event frequency

Sensitivity of post-hurricane beach and dune recovery to event frequency
bathymetry, height of the pre-storm dunes and the overwash penetration. If sufficient time is allowed for the return of vegetation and the recovery of the dunes, the variations in storm impact observed during Hurricane Ivan will be reinforced during
The recovery of Santa Rosa Island in northwest Florida is characterized following Hurricane Katrina (September 2005), which was preceded by Hurricanes Ivan (2004) and Dennis (2005). Beach and dune recovery were quantified to the east and west
of Pensacola Beach through a comparison of LiDAR data collected immediately following Hurricane Katrina and in July 2006 after almost a year of recovery. The alongshore variation in recovery is not only related to the island width, but also to the offshore

Natural recovery of compacted soils in semiarid Montana

Natural recovery of compacted soils in semiarid Montana
clay loam soils were measured. A linear recovery model based on compaction measurements gathered at the townsites indicated that complete recovery times ranged from 50 to 145 years for soils compacted principally by human trampling, and from 79 to 227

Channel incision, evolution and potential recovery in the Walla Walla and Tucannon River basins, northwestern USA

Channel incision, evolution and potential recovery in the Walla Walla and Tucannon River basins, northwestern USA
the time required for a channel to aggrade to the elevation of its former floodplain based on published aggradation rates, and examine the potential for decreasing recovery time through restoration actions.
The AA. evaluated controls on locations of channel incision, variation in channel evolution pathways and the time required to reconnect incised channels to their historical floodplains in the Walla Walla and Tucannon River basins. Controls

A method for regional-scale assessment of vegetation recovery time after high-severity wildfires : Case study of Spain

A method for regional-scale assessment of vegetation recovery time after high-severity wildfires : Case study of Spain
Ecosystem ; Forest fire ; Grassland ; Model ; Plant species ; Precipitation ; Recovery time ; Scrub ; Soil erosion ; Soil properties ; Spain ; Spatial distribution ; Vegetation ; Vegetation index
. considered, first, the vegetation in the territory, characterized by the structure of the dominant plant community (tree, shrub, or grassland) and its regeneration strategy (resprouter or seeder); and, second, two of the main factors determining recovery time
The methodology is based on map algebra and a geographical information system, which enabled calculation of the approximate time required to restore vegetation to conditions similar to pre-fire regarding plant height and canopy cover. The AA

Spatial and temporal sensivity of hydrogeomorphic response and recovery to deforestation, agriculture, and floods

Spatial and temporal sensivity of hydrogeomorphic response and recovery to deforestation, agriculture, and floods
responses in the context of both land use impacts and the timing of large floods from approximately 1880 to 1995. Field studies were combined with hydrologic and sediment-load modeling to evaluate geomorphic responses in relation to stream position. Lastly
, geomorphic recovery rates following decreases in agricultural activity during the recent decades were evaluated.

Post-Katrina population loss and uneven recovery in New Orleans, 2000–2010†

Post-Katrina population loss and uneven recovery in New Orleans, 2000–2010†
Catastrophe ; Distance from city centre ; Flood ; Hurricane ; Louisiana ; New Orleans ; Population ; Protection dyke ; Spatial variation ; Time-distance ; United States of America
such as proximity (distance or travel time) to the central business district (CBD), a natural environment variable “elevation”, and two composite socio-demographic indices derived from variables in the census. The research reveals a U-shaped population-change
profile with distance or travel time from the CBD, population loss bottomed at 4–5 kilometers (10–15 minutes) from the CBD and recovered towards both the CBD and suburbs. This suggests possible converging forces of suburbanization (that is, a nationwide
trend that began long before the hurricane) and the CBD's anchoring role in the post-Katrina recovery. Greater population loss was also observed in the socioeconomically disadvantaged and lower-elevated areas, but neighborhoods of Hispanic concentration

Effects of market fluctuations on the Sri Lankian tourist industry: resilience and change, 1981-1991

recovery of the tourist market since 1989, is examined. The progress of Sri Lanka's tourist experience over time is assessed in the light of Butler's evolutionary model of tourist development.

Vulkankitorésekre visszavezetheto anomaliak Magyarorszag homérsékletvaltozasaiban (Anomalies dans les variations de la température en Hongrie déterminées par les éruptions volcaniques)

Investigations have revealed a weak, but statistically significant volcanic signal in the long-term temperature records. The volcanic dip is about 0,5-0,8 oK and it is largest generally in the eruption year. Recovery time is about 1-3 years. - (DLO)

Slope control on the frequency distribution of shallow landslides and associated soil properties, North Island, New Zealand

on selected soil properties at larger spatial scales and over longer time periods. Research was conducted within an area of pastoral soft-rock Tertiary hill country in the North Island of New Zealand. Integrating landslide densities with soil recovery data
demonstrates that the average value of a soil property fluctuates in a saw-tooth fashion through time with the overall shape of the curve controlled by the frequency of landslide inducing storm events and recovery rate of the soil property between events
. Despite such fluctuations, there are gradual declines of total carbon content of topsoil and soil depth to bedrock, since the time of forest clearance. Results have application to large-scale sediment budget and water quality models and to the New Zealand

Changes, perturbations, and responses in geomorphic systems

Concept ; Earth surface processes ; Geomorphology ; Landscape ; Perception ; Resistance to change ; Response time ; Risk ; Sensitivity analysis
into a framework for the assessment of geomorphic changes and responses based on the four Rs : response (reaction and relaxation times), resistance (relative to the drivers of the change), resilience (recovery ability, based on dynamic stability), and recursion
In recent decades views of change, disturbance, response, and recovery in geomorphology have expanded considerably. Conceptual frameworks emphasizing single-path, single-outcome trajectories of change have been supplemented, not replaced, by multi

Natural recovery of moss-dominated biological soil crusts after surface soil removal and their long-term effects on soil water conditions in a semi-arid environment

Natural recovery of moss-dominated biological soil crusts after surface soil removal and their long-term effects on soil water conditions in a semi-arid environment
environment on the Loess Plateau of China. Over the succeeding years, the natural recovery process of BSCs was qualitatively described and the soil water content at 0–90 cm depth of the two treatments was consecutively monitored. The results showed
that : it is possible to recover moss-dominated biological soil crusts after disturbance; Crust disturbance decreased soil moisture and the effect gradually weakened with time; Crust disturbance decreased surface soil moisture but increased deep soil moisture; Crust

Post-European settlement response gradients of river sensitivity and recovery across the upper Hunter catchment, Australia

Post-European settlement response gradients of river sensitivity and recovery across the upper Hunter catchment, Australia
This study documents the catchment-wide distribution of river sensitivity and adjustment in the upper Hunter catchment, New South Wales, in the period since European settlement. The spatial distribution and timing of lateral, vertical and wholesale

Comparing the long-term impacts of different anthropogenic disturbance regimes on California sage scrub recovery

Comparing the long-term impacts of different anthropogenic disturbance regimes on California sage scrub recovery
. Native shrubs returned to the grazed valley over one and one-half times faster than they did in the cultivated valley. Cultivation might result in a type conversion of California sage scrub to exotic annual grassland that resembles a new steady state.

Beach erosion and recovery during consecutive storms at a steep-sloping, meso-tidal beach

Beach erosion and recovery during consecutive storms at a steep-sloping, meso-tidal beach
frequent topographic surveys across 11 transects. Measurements of the surf/swash zone dimensions, nearshore bar dynamics, and wave run-up were extracted from time averaged and timestack coastal images, and wave and tidal data were obtained from offshore

Disturbance, geomorphic processes and recovery of wildfire slopes in North Tyrol

Disturbance, geomorphic processes and recovery of wildfire slopes in North Tyrol
vegetation regeneration on 20 slopes of different post-fire ages, and soil erosion measurements on 2 slopes. It is highlighted that vegetation regeneration takes an extremely long time under unfavourable conditions and that soil erosion constantly increases

Bedload tracing in a high-sediment-load mountain stream

. In spring 2008, 451 tracers were deployed and 3 tracer inventories were implemented in July 2008, 2009 and 2010. Recovery rates calculated for mobile tracers declined from 78% in 2008 to 45% in 2009 and 25% in 2010. The declining recovery rate over time

Complex mass wasting response of drainage basins to forest management in coastal British Columbia

in the study basins. Logged and forested areas were compared in terms of mass wasting magnitude and frequency, with reference to site characteristics. The recovery time of the landscape after logging was assessed. Mass wasting failure was primarily controlled

A general framework for using the rate law to simulate morphological response to disturbance in the fluvial system

China ; Colorado ; Huang He ; Hydraulic works ; Hydro-geomorphology ; Impact ; Model ; Response time ; Space time ; Stream ; United States of America
, such as delayed response and/or cumulative effects, may affect morphological responses, making them capable of representing relaxation paths and times for a range of morphological response variables, whatever their initial states. To test their utility, the models
in the framework were applied to simulate the sequence of geomorphological responses to disruption observed in selected rivers with well-documented histories of morphological perturbation, adjustment and recovery. The results demonstrate that the models

Channel network extent in the context of historical land use, flow generation processes, and landscape evolution in the North Carolina Piedmont

Drainage network ; Eighteenth Century ; Ephemeral stream ; Gully erosion ; Land use ; Landscape dynamics ; North Carolina ; Overland flow ; Piedmont ; Present time ; Soil erosion ; Stream flow ; Subsurface flow ; United States of America ; Water
. However, geomorphic evidence of recovery in channel heads within fully forested watersheds is greater than those with present day pasture. Channel network extent appears to be sensitive to land use change, with recovery beginning within decades

Annual to decadal morphodynamics of the foredune system at Greenwich Dunes, Prince Edward Island, Canada

reaches of the study area, resulting in ongoing differences in foredune morphology. Although the rate of foredune development or recovery after disturbance changes over time due to morphological feedback, the overall decadal evolution of the foredune

Résultats de la recherche (4781 résultats)

Affinez votre recherche