本文選題：海洋遙感學(xué) + 地聲反演��； 參考：《應(yīng)用海洋學(xué)學(xué)報》2015年04期

【摘要】：根據(jù)2014年在南中國海開展聲學(xué)試驗的定深爆炸寬帶聲信號數(shù)據(jù)進行海底地聲參數(shù)反演.考慮到不同海底聲參數(shù)對不同聲場物理參數(shù)的敏感程度不同以及不同海底聲參數(shù)對不同反演方法的敏感程度亦不同,綜合應(yīng)用2種反演方法得到不同底質(zhì)聲參數(shù):(1)根據(jù)接收的直達波和海底反射波計算得到關(guān)注海域的海底反射系數(shù)進而反演得到海底聲阻抗;(2)實驗海區(qū)的海底地形為大陸坡,選取Hamilton總結(jié)的關(guān)于沉積物聲速與沉積物密度關(guān)系的經(jīng)驗公式,結(jié)合沉積物聲阻抗與沉積物聲速、沉積物密度的關(guān)系,進而反演得到沉積物聲速和沉積物密度.沉積物聲學(xué)參數(shù)的取樣測量是在實驗室條件下進行的,溫度為23℃,大氣壓1×105Pa,由于沉積物孔隙海水是決定沉積物聲速的關(guān)鍵且受溫度壓強變化的影響顯著,本研究利用沉積物聲速與孔隙海水聲速的比值即使在溫度壓強變化的情況下較穩(wěn)定的特點,可對沉積物聲速在實驗室條件和海底原位條件進行校正.校正到海底溫度和壓強后,反演結(jié)果與沉積物取樣的實測結(jié)果和Hamilton總結(jié)的結(jié)果吻合得相當好:(1)聲阻抗的反演結(jié)果為2.065 6×10~5g/(cm2·s),修正后的沉積物取樣結(jié)果則為2.046 0×10~5g/(cm~2·s),Hamilton總結(jié)的結(jié)果為2.238 0×10~5g/(cm~2·s);(2)聲速的反演結(jié)果為1 482.6m/s,修正后的沉積物取樣結(jié)果為1 467.5 m/s,Hamilton總結(jié)的結(jié)果為1 502.8 m/s;(3)密度的反演結(jié)果為1.393 2 g/cm3,沉積物取樣結(jié)果為1.400 0 g/cm~3,Hamilton總結(jié)的結(jié)果為1.489 0 g/cm3.
[Abstract]:Based on the broadband acoustic signal data of deep explosion conducted in the South China Sea in 2014, the subsea acoustic parameters are retrieved. Considering that the sensitivity of different underwater acoustic parameters to the physical parameters of different sound fields is different, and that different submarine acoustic parameters are also sensitive to different inversion methods, Synthetically using two kinds of inversion methods to get different bottom sound parameters: 1) according to the received direct wave and sea bottom reflection wave, the seabed reflection coefficient of the area of concern is calculated, and then the submarine acoustic impedance is obtained by inversion.) the seabed topography of the experimental sea area is continental slope. The empirical formula about the relationship between sediment sound velocity and sediment density was selected, and the relationship between sediment acoustic impedance and sediment sound velocity and sediment density was combined, and then the sediment sound velocity and sediment density were obtained. The sampling and measurement of sediment acoustic parameters were carried out under laboratory conditions at 23 鈩，

本文編號：1799612