CAJ | 학술논문

测量每年海底渗漏释放到海洋水体及大气中的具有温室效应的甲烷的量具有重要的科学意义.文章提出了测量前调整气泡状态并用透射声波波形-幅度参数测量渗漏气泡流量的新方法.通过空间频谱分析得出声波测量窗口高度小于气泡流每秒上升的距离时,文章所设计的声波传感系统可以有效地测量气泡流速.根据求解声波方程的 Born 近似方法得出了气泡直径与测量声波波长的关系,该关系是确定测量系统结构参数的依据.实验表明,采用蜂窝芯板为主的结构可把气泡调整为直径小于3mm且空间分布均匀的状态,气泡流速测量精度可达±2%,透射声波幅度与截面含气率有近线性关系;初步验证了气泡流量测量方法的可行性.
측량매년해저삼루석방도해양수체급대기중적구유온실효응적갑완적량구유중요적과학의의.문장제출료측량전조정기포상태병용투사성파파형-폭도삼수측량삼루기포류량적신방법.통과공간빈보분석득출성파측량창구고도소우기포류매초상승적거리시,문장소설계적성파전감계통가이유효지측량기포류속.근거구해성파방정적 Born 근사방법득출료기포직경여측량성파파장적관계,해관계시학정측량계통결구삼수적의거.실험표명,채용봉와심판위주적결구가파기포조정위직경소우3mm차공간분포균균적상태,기포류속측량정도가체±2%,투사성파폭도여절면함기솔유근선성관계;초보험증료기포류량측량방법적가행성.
Observations of seabed bubbles of methane, an important greenhouse gas, at a natural marine hydrocarbon seep to evaluate the global methane budget per year is very important. The objective of this paper is to develop a new approach, in which the configuration and distribution of bubbles are adjusted before flow measurement, to measure cold seepage flow on seafloor by the wave form-amplitude parameters of acoustic transmission. After the spectrum analysis we lead to the height of the measurement window through which acoustic wave transmits to the opposite wave transducer is less than the distance which bubbles go up pass per second. And the bubble speed can be effectively measured by using the acoustic sensing system designed under the proposed height of the measurement window in the paper. The relationship between the bubble diameter and the measured acoustic wavelength is obtained under the Born approximation. Diameters of bubbles become smaller than 3 mm after they go through the honeycomb-core board and other structure parts, and the distribution of bubble populations is uniform. Spatial frequency spectrum analysis is applied to establish the relationship between geometry parameters of the piezoelectric transducer and the motion of bubbles, and the measurement accuracy of bubble velocity is expected to ± 2%. The nearly linear relationship between the amplitude of sound transmission and the gas bubble flow has been established through the experiment. It turns out to be an effective method of measuring the bubble flow.