Snake Line Performance Applying Single Pixel X-Band MP Radar Data (Case of Mt. Merapi Area, Indonesia)

Ani Hairani (Department of Civil Engineering, Universitas Muhammadiyah, Yogyakarta, INDONESIA Department of Civil and Environmental Engineering, Universitas Gadjah Mada, INDONESIA)
Adam Pamudji Rahardjo (Department of Civil and Environmental Engineering, Universitas Gadjah Mada, INDONESIA)
Djoko Legono (Department of Civil and Environmental Engineering, Universitas Gadjah Mada, INDONESIA)
Istiarto Istiarto (Department of Civil and Environmental Engineering, Universitas Gadjah Mada, INDONESIA)

Journal of the Civil Engineering Forum
Vol. 5 No. 3 (September 2019)

The short-duration-rainfall monitoring techniques have become important recently due to the high demand for disaster risk miti­gation. Such techniques produce important information on the rainfall intensity during heavy rainfall in the form of snake line. At the same time, use of X-Band Multi-Parameter Radar (XMP Radar) in rainfall monitoring has increased significantly be­cause of its capacity to cover wide area. An assessment on the snake line performance that was developed based on XMP Radar and ground rainfall monitoring instrument (i.e. Automatic Rainfall Recorder or ARR) has been applied to Mt. Merapi area, Java, Indonesia. Selected rainfall data of November-December 2018 were examined. The assessment used a single pixel of radar data at the location of the ARR. The result shows that rainfall data obtained from XMP Radar are lower than those from ARR. The computed snake line obtained from XMP Radar differs from that from ARR data. The XMP Radar underestimates the warning level by about two level out of four.