Development of an Underwater Acousitic Profiler Equipped with Digital Recorder for Survey of Brackish Water Lakes

开发配备数字记录仪的咸水湖泊水下声学剖面仪

• 批准号: 04554031
• 负责人: TOKUOKA Takao
• 金额: $ 11.2万
• 依托单位: Shimane University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04554031/
• 关键词: acoustic impedance; wedge-like saline layr; Lakes Nakaumi and Shinji; echo-sounding; 汽水域; ヘドロ; 塩分躍層; 中海; 浚渫

In brackish lakes it is well known that sea water is overlain by fresh water. Their mutual boundary, which is recognized as the boundary of the haloline, sometimes appears on echo-sounding records. These phenomena are caused by the rapid change of acoustic impedance at the boundary of saline and fresh water, and has been termed the deep scattering layr (D.S.L.). The project to analyze this boundary using more sensitive echo-sounding equipment has been performed. This component was made by modification of a 200 kHz precision echo-sounder (Model 101, Senbon Denki Co., Ltd.). The receiving circuit was modified to use straight amplifiers to maintain the linearity and accuracy of signals. In addition, the recieving circuit was equipped with signal output for digital recording. The recorder consists of a 12 bit higt-speed A/D converter at 1MHz sampling and an EXABYTE tape drive using 8 mm tape (max.2.2GByte). Clear reflector in Lake Nakaumi could be observed in water about 6 m in depth with additinal refletors, correspoudig to changes in water quality, particularly changes in salinity. The newly developed underwater acoustic profiler equipped with a digital recorder can contribute much in understanding many phenomena of brackish lakes.

在咸水湖泊中，淡水覆盖着海水，这是众所周知的。它们的共同边界被认为是光晕的边界，有时会出现在回声测深记录中。这些现象是由淡水和盐水交界处的声阻抗快速变化引起的，被称为深度散射层(D.S.L.)。已经开展了使用更灵敏的回声探测设备分析这一边界的项目。该部件是通过对200 kHz精密回声测深仪(101型，Senbon Denki Co.，Ltd.)进行改装而制成的。接收电路经过改进，使用直放以保持信号的线性度和准确性。此外，接收电路还配备了数字记录的信号输出。该记录器由一个1 MHz采样的12位高速A/D转换器和一个使用8 mm磁带(最大为2.2 GB)的艾字节磁带机组成。Nakaumi湖在大约6米深的水中可以观察到清晰的反射层，加上额外的反射层，与水质的变化，特别是盐度的变化相对应。新研制的配有数字记录器的水声剖面仪可以为理解咸水湖泊的许多现象做出很大贡献。

项目成果

徳岡ほか: "音波探査による中海・宍道湖の塩分躍層の検討とその意義" LAGUNA. 1. 11-26 (1994)

Tokuoka 等：“通过声波探测研究中海湖和宍道湖的盐跃层及其意义”LAGUNA。

徳岡 隆夫,高安 克己,三瓶 良和,土屋 洋一,安間 恵,井内 美郎: "音波探査による中海浮泥層と塩水楔の検討(予報)" 山陰地域研究(自然環境). 9. (1993)

Takao Tokuoka、Katsumi Takayasu、Yoshikazu Sanpei、Yoichi Tsuchiya、Megumi Amma、Yoshiro Inouchi：“通过声波勘探对中海浮泥层和盐楔进行检查（预测）”山阴地区研究（自然环境）9。（自然环境）。 ）

徳岡ほか: "長良川下流域の音波探査による解明" 地質学雑誌. 100(発表予定). (1994)

Tokuoka 等人：“通过声波勘探阐明长良河下游”地质杂志 100（待出版）。

徳岡 隆夫,大西 郁夫,高安 克己,三瓶 良和: "海跡湖の環境地質学ー中海・宍道湖を例としてー" 地球科学. (1993)

Takao Tokuoka、Ikuo Onishi、Katsumi Takayasu、Yoshikazu Sanpei：“海洋湖泊的环境地质学 - 以 Nakaumi 湖和 Shinji 湖为例”地球科学 (1993)。

徳岡ほか: "音波探査による中海の浮泥層と塩水楔の検討(予報)" 山陰地域研究. 9. 9-17 (1993)

Tokuoka 等人：“通过声波勘探对中海浮泥层和盐楔进行检查（预测）”Sanin Regional Research（山阴地区研究）。