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| Titel |
Design of monitoring and early warning system for geo-hazards in Three Gorges reservoir area using infrasound |
| VerfasserIn |
N. Qiu, Z. X. Zeng, Y. C. Yang |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022381
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| Zusammenfassung |
| With the progress of the Three Gorges Dam Project, geological disasters have become
increasingly prominent. The reservoir area prone to landslides, collapses, cracks, and
earthquake disaster because the complex terrain and geological conditions. It is of
significance to monitor and foresee geo-hazards in the reservoir area. Here we introduce our
design of monitoring and early warning system for geo-hazards in Three Gorges reservoir
area using infrasound.
Infrasound may be abnormal during geological disasters, such as debris and earthquake
occurred. The formation a d movement of debris flow in its basin will generate infrasound,
and spread to the surrounding air medium. Velocity of infrasound is much larger than that of
debris flow, so we can monitor and forecast debris flow using infrasound. The sudden vertical
displacement brought about by earthquake will generate acoustic-gravity wave which can be
observed in distance to monitor earthquake, especially to monitor earthquake precursors. So
we try to monitor the geological disasters for the Three Gorges reservoir area in China by
design a infrasound array monitor system. This work is supported by Chinese "985
Project".
The infrasound monitor system is comprised of two observation stations arranged in
Badong county inside the reservoir area and in Wuhan city, respectively. Each station has
respectively arranged a kind of augmentable linear array in the form of quasi-uniform linear
array and additional amending direction sensors. The linear array comprises eight sensors
arranged in several different uniform intervals along a line. The amending direction sensor is
situated at certain point in mid-perpendicular of linear array in order to reduce multiplicity in
determine the direction of arrival. The sensors used in the system are CDC-2B capacitances
infrasonic receiver which can observe frequency ranging 0~20Hz. The, measurement
resolution is 750mV/LPa. Infrasonic wave signal collected by sensor is transferred from
observation stations to Data Processing Centre in China University of Geosciences, using
telecommunication networks, and then we can process and analyze the infrasonic
signals.
Observations all-weather infrasound near the reservoir area can be achieved
on monitoring geological disasters in Yangtze River Three Gorges. There are still
problems to be considered in the system: (1) in the conditions of using few sensors,
this system need more rational array layout mode; (2) array sensors in field can
lasting stability in some way; (3) the amount of data acquisition, real-time data
transmission, storage and backup need higher demands in hardware and software. |
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