| Summary: | 碩士 === 華梵大學 === 環境與防災設計學系碩士班 === 107 === Huafan University is located in the Ta-Lun Shan area of Shih ding District, New Taipei City. It is about 430 meters to 570 meters above sea level. There is a weather station on the campus to measure the rainfall and temperature data. For slope disaster prevention there are SAA (Shape Accel Array) observation instruments to monitor slope displacement. The area of Huafan University is listed in the landslide-landslip geologically sensitive area by the Central Geological Survey. The analysis of slope displacement is more important. This study is separated into two parts. First is to analysis the characteristic of different duration rainfall intensity–duration-frequency Curve (IDF) in Huafan University, and second is to induce rainfall with tilting displacement greater than 0.5mm.
The first part selects the date from 2004 to 2017 of Huafan weather station, and selects the annual maximum rainfall data from 5 minutes to 1 hour called short duration and 1 hour to 48 hours called long duration. By frequency analysis, the most suitable theoretical probability distribution is obtained, the short duration IDF and the long duration IDF are established. It is known from the study that the long duration IDF formula estimates the short duration rainfall intensity value, which is overestimated, especially when the rainfall duration is 5 minutes. The data of four days cumulative rainfall amount greater then 100mm are used to as the background value of the second part of the analysis. The second part is to select the data with the daily displacement greater than 0.5mm from SAA for the number SIS-11A and the four-day cumulative greater than 100mm, and calculate the average rainfall intensity value in two different ways. The first type is the day when the displacement occurs, as the first day, and continues to calculate forward. The second type is the three days before the tilting displacement day as the first day, and then continues to calculate backwards. Will these two methods are compared to the background values. The rainfall intensity during typhoon is widely distributed on one day and two days. The daily rainfall intensity falls between 1 (mm/day) and 305 (mm/day). The distribution of rainfall intensity on the three days and four days is concentrated. The rainfall intensity falls between 47 (mm/day) and 147 (mm/day), while the rainfall intensity of the southwest monsoon affects the four days rainfall intensity from 28 (mm/day) to 85 (mm/day). The four days rainfall intensity falls from 25 (mm/day) to 55 (mm/day). It has probability to occur tilting displacement greater than 0.5 mm when rainfall intensity is small.
Keywords： Frequency Analysis、IDF、Shape Accel Array、Tilting Displacement
|
|---|
