scholarly journals Using Video Monitoring to Test a Fetch-Based Aeolian Sand Transport Model

2020 ◽  
Vol 8 (2) ◽  
pp. 110 ◽  
Author(s):  
Pam Hage ◽  
Gerben Ruessink ◽  
Zilla van Aartrijk ◽  
Jasper Donker
Keyword(s):  
Wind Velocity ◽  
Transport Model ◽  
Transport Rate ◽  
Beach Sand ◽  
Sand Transport ◽  
Winter Period ◽  
Aeolian Sand ◽  
Aeolian Transport ◽  
Aeolian Sand Transport ◽  
Strong Winds

Transport of beach sand to the foredune by wind is essential for dunes to grow. The aeolian sand transport rate is related to wind velocity, but wind-based models often overpredict this transport for narrow beaches (<100 m). To better predict aeolian sand transport, the fetch-based Aeolus model was developed. Here, we qualitatively test this model by comparing its transport-rate output to visual signs of aeolian transport on video imagery collected at Egmond aan Zee, the Netherlands, during a six-month winter period. The Aeolus model and the Argus images often agree on the timing of aeolian transport days, except when transport is small; that is not always visible on the Argus images. Consistent with the imagery (minimal signs of aeolian activity in strong winds), the Aeolus model sometimes predicts the actual transport to be smaller than the potential transport. This difference is largest when wind velocity is large, and its direction is cross-shore. Although transport limitations are not predicted to be common, the results suggest that their effect on the total transport in the study period was substantial. This indicates that the fetch distance should be taken into account when calculating aeolian transport for narrow beaches on longer timescales (>weeks).

Influence of vegetation on aeolian sand transport rate from a backshore to a foredune at Hasaki, Japan

Sedimentology ◽  
2005 ◽  
Vol 52 (5) ◽  
pp. 1123-1132 ◽  
Author(s):  
YOSHIAKI KURIYAMA ◽  
NORIO MOCHIZUKI ◽  
TSUYOSHI NAKASHIMA
Keyword(s):  
Transport Rate ◽  
Sand Transport ◽  
Aeolian Sand ◽  
Sand Transport Rate ◽  
Aeolian Sand Transport

scholarly journals FIELD MEASUREMENT OF AEOLIAN SAND FLUX USING CERAMIC SAND FLUX SENSOR UD-101 AT A SAND DUNE

2011 ◽  
Vol 1 (32) ◽  
pp. 109
Author(s):  
Keiko Udo ◽  
Junaidi Junaidi ◽  
Shin-ichi Aoki ◽  
Shota Mitsushio ◽  
Shigeru Kato ◽  
...  
Keyword(s):  
Wind Velocity ◽  
Sand Dune ◽  
Field Measurements ◽  
Sand Transport ◽  
Aeolian Sand ◽  
Aeolian Sand Transport ◽  
Charnock Constant ◽  
Sand Flux ◽  
Transport Flux ◽  
Flux Sensor

This study conducted field observations in terms of the number of blown sand impacts and wind velocity at an open ocean beach in Japan, in order to investigate characteristics of the aeolian sand transport flux over a sand dune slope. Charnock constant of a roughness length equation calculated from wind velocity data had a larger value over the slope compared to over a flat. Furthermore, the aeolian flux over the slope tended to be larger than that over the flat. Characteristics of the Charnock constant and the aeolian flux over the flat and the slope were demonstrated from the field measurements.

scholarly journals Estimating Annual Onshore Aeolian Sand Supply from the Intertidal Beach Using an Aggregated-Scale Transport Formula

2018 ◽  
Vol 6 (4) ◽  
pp. 127 ◽  
Author(s):  
Leonardo Duarte-Campos ◽  
Kathelijne Wijnberg ◽  
Suzanne Hulscher
Keyword(s):  
Moisture Content ◽  
High Tide ◽  
Sand Transport ◽  
Wind Gust ◽  
Aeolian Sand ◽  
Aeolian Transport ◽  
Aeolian Sand Transport ◽  
Sand Supply ◽  
Transport Prediction ◽  
High Tide Line

In this paper, we explore an approach for annual-scale transport prediction from the intertidal beach, in which we aggregate the surface conditions of the intertidal beach, in particular moisture content and roughness, and use hourly monitoring data of wind speed and wind direction. For our case study area (Egmond Beach, The Netherlands), we include Argus video imagery in our analysis to assess the occurrence of aeolian sand transport. With the approach described to determine a characteristic moisture content value for aeolian transport, we obtained surface moisture values of 1.2% to 3.2% for wind average and wind gust respectively, implying that we need a quite dry beach. This indicates that the main area for aeolian transport corresponds to the upper part of the intertidal source, most likely the region between mean high tide line and spring high tide line.

scholarly journals Consequences of a Storm Surge for Aeolian Sand Transport on a Low-Gradient Beach

2020 ◽  
Vol 8 (8) ◽  
pp. 584
Author(s):  
Jorn T. Tuijnman ◽  
Jasper J. A. Donker ◽  
Christian S. Schwarz ◽  
Gerben Ruessink
Keyword(s):  
Storm Surge ◽  
Volume Growth ◽  
Primary Source ◽  
Beach Sand ◽  
Sand Transport ◽  
Strong Wind ◽  
Aeolian Sand ◽  
Aeolian Sand Transport ◽  
Wind Events

Wind-blown beach sand is the primary source for the volume growth of the most seaward dune, the foredune. Strong wind events can potentially dominate long-term aeolian supply but in reality do not contribute considerably because they often coincide with a storm surge. The aim of this paper is to further our understanding of how a storm surge prevents or severely restricts aeolian supply. Using field data collected on the 1:50 sloping Egmond beach (Netherlands) in the aftermath of a 1-m storm surge, we show that the ground water in the upper beach rose to well above normal levels during the surge, which resulted in the development of a seepage face during falling tide and hence persistent saturation of the emerging beach. Using a fetch-based model, we predicted aeolian supply during the 2-day surge period to be about 66% of the potential supply. Fetch limitations imposed by the surge-induced inundation and the continuous saturation of the sand on the emerging beach both contributed to the predicted supply limitation. Our results quantitatively support earlier studies that suggested surges to be the primary condition that causes predictions of long-term potential foredune growth to overestimate measured growth.

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