Flashiness Index of Several Rivers in the Citarum Basin, West Java

1st UPI International Geography Seminar 2017

Pratama, G.^1 ; Kusratmoko, E.^1

Department of Geography, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok, Indonesia^1

关键词: Daily rainfall;    Drainage density;    Land-use change;    Morphometric characteristics;    Mountainous regions;    Negative correlation;    Positive correlations;    Strong correlation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/145/1/012107/pdf
DOI  :  10.1088/1755-1315/145/1/012107

来源: IOP

【 摘 要 】

This paper discusses the flashiness index of four rivers in the Citarum watershed, namely the Cisokan River, CIkundul, Cimeta and Cibalagung. The trend of the flashiness index of a river can be an indication of the changes occurring within the watershed. The flashiness is calculated by the Richards-Baker flashiness index (FI), which is the ratio of absolute day-to-day fluctuations of streamflow relative to total flow in a year on in a season. We analyzed daily streamflow data for the period 1994-2016. The results show that the mean annual flashiness index in the four watershed varies between 0.29 and 0.39, which is relatively homogenous showing the characteristic of a mountainous region. The high flashiness index occurs in the dry and transition season. Morphometric characteristic of the Cikundul watershed, such as low drainage density and basin slope, generated low flashiness index. The negative correlation between the flashiness index with mean annual flow discharge, while a positive correlation with the mean daily rainfall. The strong correlation is found particularly in the transition season, in the Cikundul and Cimeta, and dry season in the Cibalagung. The effect of land use change, especially changes in forest area, in this study is rather difficult to determine because the observation time is relatively short.