Rainfall Analyses of Coonoor Hill Station of Nilgiris District for Landslide Studies

International Conference on Civil Engineering and Infrastructural Issues in Emerging Economies 2017

土木建筑工程;经济学

Sujatha, Evangelin Ramani^1 ; Suribabu, C.R.^1

School of Civil Engineering, SASTRA University, Thanjavur

613401, India^1

关键词: Annual rainfall;    Antecedent rainfall;    Daily rainfall;    Post-monsoon;    Preventive measures;    Rainfall analysis;    Rainfall event;    Triggering factors;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/80/1/012066/pdf
DOI  :  10.1088/1755-1315/80/1/012066

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

The most common triggering factor of landslides in a hill terrain is rainfall. Assessment of the extreme and antecedent rainfall events and its quantum is imperative to evaluate the temporal occurrence of landslides. It also plays a vital role in the choice of the preventive measures to be adopted. This study focuses on an in-depth rainfall analysis of Coonoor hill station. The analysis includes the study of monthly, seasonal and annual rainfall patterns for a period of 80 years, between 1935 and 2013. Further, one day maximum, 5 day and more antecedent rainfall and its amount is calculated for the years between 2007-2012, 2014 and 2015.The result of the study indicates an increase in the normal rainfall based on the mean of 30 years of data (for the recent decades) and erratic pattern of rainfall during pre-monsoon, post-monsoon south-west monsoon periods. A detailed analysis of daily rainfall for the selected period indicates that extreme highest daily rainfall of more than 300 mm above occurred after consecutive rainfall trigged massive landslides comparing highest rainfall amount around 100 to 180 mm rainfall events.