AN IN-SITU RESISTIVITY MONITORING SYSTEM FOR SEABED EROSION AND DEPOSITION CHANGES AND ITS EXPERIMENT STUDY
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摘要: 设计了一套基于电阻率方法的海床蚀积变化原位监测系统,该系统能够在数米水深处实施长距离自动监测。系统同时采用USB海量存储技术和GPRS无线通信两种数据存储和传输方式,可以实现长期无人值守原位监测。利用海水和沉积物两者电阻率的差异性,把布设等间距环形电极的探杆置入海床,连续测定海水和海床沉积物界面上下一定范围内的电阻率,找到电性发生显著变化的区间,并采用合适的方法判定界面的具体位置。界面位置随时间的变化,即为海床的蚀积变化。实验室测试结果表明该系统测试的沉积过程中蚀积变化数据与实际数据相符,最大误差0.3 cm。说明应用该系统测量海床蚀积状况具有可行性。Abstract: In this paper, we provided a design of an in-situ monitoring system for seabed erosion and deposition based on resistivity, which may carry out long distance automatic monitoring in a water depth of a few meters. It uses two kinds of data storage and transmission mode, i.e. the USB mass storage technology and GPRS wireless communication, to achieve long-term unattended in-situ monitoring. Utilization of the different resistivity between seawater and seabed sediments, an electrode probe rod layout spacing ring is imbedded into the seabed, and continuous testing resistivity around the seawater and seabed sediment interface up to a certain level, of which the change in interval electricity is large enough. And then use the appropriate method to determine the accurate interface position. The interface position changes with time, up to the change in seabed erosion and deposition. Laboratory experiments show that the tested erosion and deposition data conforms well to the actual data during deposition process, and the maximum error between the two kinds of data is less than 0.3cm. At present, the system can effectively work in shallow beach area (a few meters of water depth) for automatic in situ monitoring of seabed erosion and deposition.
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Key words:
- seabed /
- sediments /
- erosion and deposition /
- resistivity monitoring instrument /
- In-situ
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