Ship Wakes and Their Potential Impacts on Salt Marshes in Jamaica Bay, New York

被引:16
作者
El Safty, Hoda [1 ,2 ]
Marsooli, Reza [1 ]
机构
[1] Stevens Inst Technol, Dept Civil Environm & Ocean Engn, Hoboken, NJ 07030 USA
[2] Cairo Univ, Fac Engn, Irrigat & Hydraul Dept, POB 12211, Giza 12613, Egypt
关键词
ship wakes; FUNWAVE; salt marsh erosion; Jamaica Bay; BOUSSINESQ-TYPE EQUATIONS; SEDIMENT SUSPENSION; EROSION; WAVES; CHANNEL; ZONE;
D O I
10.3390/jmse8050325
中图分类号
U6 [水路运输]; P75 [海洋工程];
学科分类号
0814 ; 081505 ; 0824 ; 082401 ;
摘要
Aerial photographs and field studies have revealed a rapid deterioration of salt marshes in Jamaica Bay, New York. Past studies have linked marsh deterioration to sediment supply, water quality, storms, and sea level rise. Yet ship wakes and their potential impacts on marsh edge erosion are not understood. Here, we study ship wake transformation in Jamaica Bay and their potential impacts on salt marsh erosion. We apply short-time, Fourier transform (spectrogram) on existing water level measurements collected during 2015 and 2016. Our analysis reveals the existence of typical wake components. Among the observed wake components is a long wave component which propagates over shallow areas where short wind waves do not reach. We further implement a phase-resolving wave model to study wake transformation in the vicinity of salt marsh islands Little Egg and Big Egg and the consequent morphological changes. The selected marshes are located near a deep shipping channel and a ferry station, making them exposed to wakes of vessels with different size and sailing speed. A series of numerical experiments show that ship wakes can result in erosion spots near the border of deep shipping channels and their banks, i.e., edges of mudflats and marsh substrates. We show that the cumulative erosion increases rapidly with the number of vessels that pass through the study area. For instance, the magnitude of final bed erosion after the passage of 10 vessels is two to three times larger than that after the passage of five vessels.
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页数:17
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