Browse wiki
From CSDMS
he/him +
There is growing recognition that outwash … There is growing recognition that outwash events are potent agents of morphological change in some coastal regions. Outwash associated with inundation from the back side (bay, lagoon, sound, or marsh) occurred during Hurricane Harvey in Texas (2017) and Hurricane Dorian in North Carolina (2019). In both cases, floodwaters crossed the barrier islands and drained to the ocean through gaps in the primary dune lines, incising deep (~2-m) channels 30- 100-m wide in the islands and depositing the sand in the ocean. In both cases, partial recovery occurred within days and months as nearshore and beach processes generated spits, bars, berms, and overwash fans that rebuilt the beach and closed the channels, creating a series of ponds. Normally, washover deposits are quickly (1 – 2 years) revegetated with beach grasses that trap wind-driven sand and initiate dune building. However, in Texas, North Carolina, and several other locations where outwash channels were observed, the channels have remained largely unvegetated and no dunes have appeared. We have adapted a simple conceptual model to account for these observations. The model argues that the rate of vegetation growth depends, at least partially, on the amount of vegetation already present. In the case of overwash, material is deposited on older washover fans or platforms that contain live plants, seeds, rhizomes, and other organic material, and (following others) we suggest that the amount of vegetative material is a function of washover-deposit thickness. In contrast, when washout channels are filled, none of that material is present, and our model assigns these deposits very low initial amounts of vegetative material. Thus, vegetation growth on the two landscapes occurs at different rates, and the former outwash channels are unable to build elevation as quickly, leaving them continuously exposed to overwash events. A quantitative implementation of this model provides results that match well with observations at several sites.h well with observations at several sites.
Image:Sherwood2024meeting.png +
Conceptual Model for Vegetation Growth<br>in Overwash and Former Overwash Landscapes +
Conceptual Model for Revegetation of Barrier Islands after Outwash and Overwash Events +
Woods Hole +
United States +
jover@usgs.gov +
US Geological Survey +
Woods Hole +
csherwood@usgs.gov +
Chris +
US Geological Survey +
Sherwood +
7742699399 +
Image: +
2) Vegetation as ecogeomorphic features +
3) Parameterizing human dynamics in geomorphic models: learning from coastal barrier evolution models +
4) A Hands-On Workshop on GPU-Based Landscape Evolution Modeling +
United States +
Creation date"Creation date" is a predefined property that corresponds to the date of the first revision of a subject and is provided by <a target="_blank" rel="nofollow noreferrer noopener" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
17:36:02, 29 March 2024 +
Has query"Has query" is a predefined property that represents meta information (in form of a <a target="_blank" rel="nofollow noreferrer noopener" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a target="_blank" rel="nofollow noreferrer noopener" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
Last editor is"Last editor is" is a predefined property that contains the page name of the user who created the last revision and is provided by <a target="_blank" rel="nofollow noreferrer noopener" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a target="_blank" rel="nofollow noreferrer noopener" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
00:52:04, 30 March 2024 +
{{{OtherCountry}}} +
Processing error"Processing error" is a predefined property provided by <a target="_blank" rel="nofollow noreferrer noopener" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> and represents errors that appeared in connection with improper value annotations or input processing.
Coastal Working Group +
