Examination of flowing groundwater condition on riverbank bed using One-meter Depth Temperature and Multipoint Temperature Logging

The Tenth International Symposium on Mitigation of Geo-disasters in Asia Matsue Symposium Place: Shimane Civil Center, Matsue Date: 8 October 2012Various types of soil disaster related with groundwater behaviour. Especially, flowing groundwater flows in very local area causes destabilization of the soil structure. It is very important for clarification of mechanism of the soil disasters. However, exploration of flowing groundwater in local area is very difficult because of heterogeneity of soil quality and groundwater condition. This paper has provided principle and measurement results of two types of exploring method of flowing groundwater. One-meter Depth Temperature method is developed to get information of flowing groundwater route reflected by the ground surface. One-meter Depth Temperature is simple, inexpensive and stable method to detect the local flowing groundwater. We can get information of existence of flowing groundwater by measuring one-meter depth soil temperature, simply. Multipoint Temperature Logging method is also developed. We can get information of vertical location of layers with flowing groundwater. Boring hole was used in Multipoint Temperature Logging method. Measurement of vertical temperature distribution of temperature decreasing process indicates the location of the layers with flowing groundwater. Results of these two methods indicated the three dimensional location of existence of the flowing groundwater in detail

Third data release of the Hyper Suprime-Cam Subaru Strategic Program

This paper presents the third data release of the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP), a wide-field multi-band imaging survey with the Subaru 8.2 m telescope. HSC-SSP has three survey layers (Wide, Deep, and UltraDeep) with different area coverages and depths, designed to address a wide array of astrophysical questions. This third release from HSC-SSP includes data from 278 nights of observing time and covers about 670 deg2 in all five broad-band filters (grizy) at the full depth (∼26 mag at 5σ depending on filter) in the Wide layer. If we include partially observed areas, the release covers 1470 deg2. The Deep and UltraDeep layers have ∼ 80% of the originally planned integration times, and are considered done, as we have slightly changed the observing strategy in order to compensate for various time losses. There are a number of updates in the image processing pipeline. Of particular importance is the change in the sky subtraction algorithm; we subtract the sky on small scales before the detection and measurement stages, which has significantly reduced the number of false detections. Thanks to this and other updates, the overall quality of the processed data has improved since the previous release. However, there are limitations in the data (for example, the pipeline is not optimized for crowded fields), and we encourage the user to check the quality assurance plots as well as a list of known issues before exploiting the data