Abstract
Abstract. Over 1992–2018, groundwater overexploitation had caused large-scale land subsidence in the Choshui River Alluvial Fan (CRAF) in Taiwan. The Taiwan High Speed Railway (THSR) passes through an area of severe subsidence in CRAF, and the subsidence poses a serious threat to its operation. How to effectively monitor land subsidence here has become a major issue in Taiwan. In this paper, we introduce a multiple-sensor monitoring system for land subsidence, including 50 continuous operation reference stations (CORS), multi temporal InSAR (MT-InSAR), a 1000 km levelling network, 34 multi-layer compaction monitoring wells and 116 groundwater monitoring wells. This system can monitor the extent of land subsidence and provide data for studying the mechanism of land subsidence. We use the Internet of Things (IoT) technology to control and manage the sensors and develop a bigdata processing procedure to analyse the monitoring data for the system of sensors. The procedure makes the land subsidence monitoring more efficient and intelligent.
Highlights
Due to the continuous growth of population and economy in Taiwan, more water resources are needed
In the center of the bowl-shaped subsidence area, the data from the continuous operation reference stations (CORS) GPS stations and multi-layer compaction monitoring wells were used to analyze the mechanism of land subsidence
The distances to the foresight and back sight were measured by an electronic distance measurement (EDM) device to ensure the two are nearly identical
Summary
Due to the continuous growth of population and economy in Taiwan, more water resources are needed. The underground water resources will no longer be utilized These land subsidence problems will increase the social cost. Severe land subsidence has occurred in the southwestern coastal areas, especially over Choushui River Alluvial Fan (CRAF) in recent years. Because the upstream watershed area of Choshui River is wide and infiltrative, surface water in the head of the fan penetrates the ground to recharge the sub-surface aquifers over CRAF. The withdrawal of groundwater can decrease the water level and reduce the porous pressure and increase the effective stress, inevitably leading to land subsidence. In the center of the bowl-shaped subsidence area, the data from the CORS GPS stations and multi-layer compaction monitoring wells were used to analyze the mechanism of land subsidence
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