ANALISIS LIMPASAN LANGSUNG METODE NAKAYASU MENGGUNAKAN DATA HUJAN TRMM STUDI KASUS DAS GENDOL
Abstract
The importance of water in hydrological analysis needs to utilize rain
data optimally, but the unavailability of a rain gauge evenly is one reason it is
difficult to study rainfall’s data that is accuratly and reliablly, so the researchers
find alternatives to obtain rainfall, one of which is to use Tropical Rainfall
Measuring Mission (TRMM) satellite. TRMM is a satellite designed to monitor
rainfall in tropical and subtropical regions, as well as to know the mechanism of
global climate change and monitoring environmental variations. This study applies
the Nakayasu for direct runoff hydrograph analysis . data from Automatic Rainfall
Recorder (ARR) and from TRMM satellites. The research location was the Gendol
watershed in February 2017. The purpose of this study was to compare direct runoff
hydrographs with rain data input from TRMM satellites and ARR stations and
compared to AWRL discharge. The results of the study show that the results of the
evaluation of the accuracy of the model using the conformity index model (R2) have
a fairly good value of 0.41806. Based on the effective coefficient, the CE value is
2.792 where optimization is very efficient, which means there is an indication that
the hydrograph has an overall match. However, based on the value of wave error
and peak discharge error data have the less accurate