SYSTEM AND METHOD FOR GROUND DISPLACEMENT OBSERVATION

PROBLEM TO BE SOLVED: To detect a ground displacement with a high precision by focusing attention on the snow melting which is one of the causes of the ground displacement while suppressing the power consumption with a simple structure.SOLUTION: Wireless signals including measurement values from a plurality of sensor nodes 10 provided on an observation area 2 are transmitted to a gateway device 20. The sensor node 10 includes an inclination sensor 15, a wireless device 12 and an antenna 13. The antenna 13 is provided at a height under which at least a portion of the antenna is covered with snow. A server device 30 determines the presence or absence of the snow melting in the observation area 2 based on the change of reception electric field intensity of the wireless signal received from the sensor node 10 by the gateway device 20. When the server device 3 determines that the snow melting exists in the observation area 2, the gateway device 20 transmits a consumption power control instruction 600 including the instruction for releasing the restriction of the power consumption to the sensor node 10. The sensor node 10 releases the restriction of the power consumption upon receipt of the power consumption control instruction 600.SELECTED DRAWING: Figure 11 【課題】地盤変位の要因の一つである融雪に着目し、消費電力を抑えつつ簡素な構成にて高精度で地盤変位を検知する。【解決手段】観測エリア２に設けた複数のセンサノード１０から計測値を含む無線信号をゲートウェイ装置２０に送信する。センサノード１０は、傾斜センサ１５、無線装置１２、及びアンテナ１３を含む。アンテナ１３は、積雪時に少なくともその一部が埋雪される高さで設ける。サーバ装置３０が、ゲートウェイ装置２０がセンサノード１０から受信する無線信号の受信電界強度の変化に基づき、観測エリア２における融雪の有無を判定する。サーバ装置３が観測エリア２に融雪があったと判定した場合、ゲートウェイ装置２０はセンサノード１０に消費電力の制限を解除する指示を含む消費電力制御指示６００を送信する。センサノード１０は、消費電力制御指示６００を受信すると消費電力の制限を解除する。【選択図】図１１