Study on 2D Landslip Monitoring Device and Warning by Using Optical Images

• Main Authors: Fang, Yu-Cing, 方育清
• Other Authors: Lena Chang
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/83249811460594280066

碩士 === 國立臺灣海洋大學 === 通訊與導航工程學系 === 103 === Taiwan possesses a special geography environment such as steep and high mountains, limited country and densely populated. Moreover, lots of people grow shallow-rooted plants and construct residence house on the hillside. Due to the over-exploitation, our land becomes vulnerable. Therefore, typhoon and heavy rain often result in the disasters such as debris avalanche, rock landslides, landslip, and the loss of human life and property. The existing monitoring systems are hard to achieve accurate measurement and immediate land sliding warning due to its unfavorable in measurement error, complex and uneasy interpreting data. To improve the disadvantage of existing monitoring systems, in this study, we designed a landslip monitoring system which is composed of a laser transmitter and monitoring box. Monitoring box contains a low-resolution camera which can capture images and return images to a computer via a wireless network. Monitoring client will obtain images, perform real-time image processing by morphology technique and compute the amount of slip displacement. Besides the proposed system can determine whether the landslip displacement exceeds the warning threshold and send a warning e-mail message to the relevant organization or institution automatically. Experiments verify that the proposed monitoring system can quickly detect and trace landslip displacement and the accuracy up to 0.2mm. In addition, the presented system is less sensitive to the weather and light effect. Compared to the existing monitoring system, our developed system possesses low cost, high accuracy, easily constructive and maintainable characteristics. Experiments outdoors show that the measurement error is still within the acceptable range even for slope gradient greater than 45 degrees. These results validate the contribution of this system in geodesic survey field.