Statistical Analysis of 30 Years Rainfall Data: A Case Study

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

土木建筑工程;经济学

Arvind, G.^1 ; Ashok Kumar, P.^1 ; Girish Karthi, S.^1 ; Suribabu, C.R.^1

School of Civil Engineering, SASTRA University, Thanjavur

613 401, India^1

关键词: Coefficient of variation;    Design and analysis;    Engineering design;    Engineering structures;    Rainfall variability;    Scientific results;    Seasonal rainfall;    Standard deviation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/80/1/012067/pdf
DOI  :  10.1088/1755-1315/80/1/012067

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

Rainfall is a prime input for various engineering design such as hydraulic structures, bridges and culverts, canals, storm water sewer and road drainage system. The detailed statistical analysis of each region is essential to estimate the relevant input value for design and analysis of engineering structures and also for crop planning. A rain gauge station located closely in Trichy district is selected for statistical analysis where agriculture is the prime occupation. The daily rainfall data for a period of 30 years is used to understand normal rainfall, deficit rainfall, Excess rainfall and Seasonal rainfall of the selected circle headquarters. Further various plotting position formulae available is used to evaluate return period of monthly, seasonally and annual rainfall. This analysis will provide useful information for water resources planner, farmers and urban engineers to assess the availability of water and create the storage accordingly. The mean, standard deviation and coefficient of variation of monthly and annual rainfall was calculated to check the rainfall variability. From the calculated results, the rainfall pattern is found to be erratic. The best fit probability distribution was identified based on the minimum deviation between actual and estimated values. The scientific results and the analysis paved the way to determine the proper onset and withdrawal of monsoon results which were used for land preparation and sowing.