The Effect of Climate Change on Rain Characteristics in the Mepanga Watershed

Abstract

Climate change has brought changes to the characteristics of the rain, wherein the rainy season duration is short; however, the dry season is getting longer. This study aims to detect the climate change presence or absence, identify the relationship of climate change to the nature of rainfall, and the relationship of climate change to rainy, humid and dry months. This research was conducted in the Mepanga Watershed, Parigi Moutong Regency, Central Sulawesi, Indonesia. The Makesens method is used for climate change detection. The rainfall characteristics use standard deviation statistical methods; furthermore, the Oldman method is used for dry, humid, and wet months. The data used is rainfall data for 30 years (1990-2019) from Kayu Agung Station. The results show that there has been a climate change in the Mepanga watershed. Marked by a Z ≠ zero value, where there is a positive trend (Z> 0) and a negative trend (Z <0). The increase in rainfall and conversely indicates the positive trend; otherwise, a decrease in rainfall indicates a negative trend. There is an effect of climate change on the nature of rain, wet, humid and dry months but not significant.

Study of rain pattern and rain characteristics on design flood discharge as the impact of climate change

“…The location of this research is in the Bangga watershed, Sigi Regency, Central Sulawesi, Indonesia with a watershed area of 65.90 km 2 [3], [8], [9], [10], [11], [12], [13], [14], [15], [16]:…”

“…Pattern B or equatorial pattern, the distribution of rainfall with two maximums, around April and October; 3). Pattern C or local pattern, where the distribution of monthly rainfall is opposite to pattern A. b) The nature of rain The evaluation of rainfall characteristic can be calculated using the standard deviation equation that divided into five characteristics of rain, namely [15], [18]:…”