University:
Boston University
Course:
CAS EE 100 | Environmental Change and Sustainability
Academic year:

2023
Views:

224

Pages:

15
Author:

kerlm3wb

Hurricane Bob-August 18-20, 1991 The correcQon formula derived by Jelesnianski (1966) with an adjustment of the hurricane moving velocity ! ! ! # r / Rmax V = V10sym + # # 1+ r / R max " ( ) $ & ! ' V path 2& & % ! V10sym ! V path ! ! V10sym = 0.8! Vsym ! Vsym ( X ! r $ * ** Vmax ## R && " max % =) X * !R $ max & * Vmax # " r % *+ (r < R ) max (R max ' r ' 3Rmax ) the symmetric wind vector at the 10-‐m height, the hurricane moving velocity vector; r the radial distance from the hurricane center; Rmax the radius of maximum winds 1 2 The atmospheric pressure ( P ) was defined as the sum of the surrounding dynamics pressure ( Pd ) and the hurricane central atmospheric pressure ( Pc ), i.e., P = Pc + Pd " V! 2 % ! !Pd sym = !air $ + f Vsym ' $ r ' !r # & Signiﬁcant Wave Height and Peak Periods Observed Tidal elevaQon No waves With waves DistribuQons of Signiﬁcant wave height VerQcally averaged Near-‐surface velocity Near-‐bogom velocity Summary • The wave-‐current interacQon caused a signiﬁcant change of the current direcQon and mixing, but had relaQvely ligle contribuQon to the maximum sea level along the coast. • DiagnosQc analyses suggest that the contribuQon of hurricane-‐derived wave-‐current interacQon to the net water ﬂux varies in space and Qme. • The hurricane-‐induced wave-‐current interacQon could generate strong verQcal current shear in the straQﬁed areas, leading to strong oﬀshore transport near the bogom and enhanced water mixing over the conQnental shelf. StraQﬁcaQon also could result in a signiﬁcant diﬀerence of water currents around islands where the water is not verQcally well mixed.