Effect of variations in rainfall intensity on slope stability in Singapore  

作　　者：Christofer Kristo Harianto Rahardjo Alfrendo Satyanaga 

机构地区：[1]School of Civil and Environmental Engineering,Nanyang Technological University,Hall of Residence 9,Block 46,#04-867,Singapore 639811,Singapore [2]School of Civil and Environmental Engineering,Nanyang Technological University,Blk N1,50 Nanyang Avenue,Singapore 639798,Singapore

出　　处：《International Soil and Water Conservation Research》2017年第4期258-264,共7页国际水土保持研究（英文）

摘　　要：Numerous scientific evidence has given credence to the true existence and deleterious impacts of climate change.One aspect of climate change is the variations in rainfall patterns,which affect the flux boundary condition across ground surface.A possible disastrous consequence of this change is the occurrence of rainfall-induced slope failures.This paper aims to investigate the variations in rainfall patterns in Singapore and its effect on slope stability.Singapore's historical rainfall data from Seletar and Paya Lebar weather stations for the period of 1985–2009 were obtained and analysed by duration using linear regression.A general increasing trend was observed in both weather stations,with a possible shift to longer duration rainfall events,despite being statistically insignificant according to the Mann-Kendall test.Using the derived trends,projected rainfall intensities in 2050 and 2100 were used in the seepage and slope stability analyses performed on a typical residual soil slope in Singapore.A significant reduction in factor of safety was observed in the next 50 years,with only a marginal decrease in factor of safety in the subsequent 50 years.This indicates a possible detrimental effect of variations in rainfall patterns on slope stability in Singapore,especially in the next 50 years.The statistical analyses on rainfall data from Seletar and Paya Lebar weather stations for the period of 1985–2009 indicated that rainfall intensity tend to increase over the years,with a possible shift to longer duration rainfall events in the future.The stability analyses showed a significant decrease in factor of safety from 2003 to 2050 due to increase in rainfall intensity,suggesting that a climate change might have existed beyond 2009 with possibly detrimental effects to slope stability.

关 键 词：Climate change RAINFALL SEEPAGE Slope stability 

分 类 号：P46[天文地球—大气科学及气象学]