Abstract
Hydrological drought is water deficit from normal conditions on the hydrological system. Hydrological drought occurs through a complex process preceded by a rainfall deficit. The series of processes that show a change of drought signals through the hydrological cycle is expressed as drought propagation. This study aims to identify the characteristics of hydrological and meteorological drought and to identify meteorological drought propagation to hydrological drought through Larona Watershade. Standardized Precipitation Index (SPI) is used as indicator to identify meteorological drought while hydrological drought is characterised by Standardised Streamflow Index (SSI) with 1, 3, 6 and 12 months accumulation periods. Propagation meteorological drought to hydrological drought was analyzed using Pearson correlation. The results showed that duration and severity escalate by the increase in the accumulation period SPI and SSI. While the number of drought events is inversely proportional to the accumulation period SPI and SSI. Althought the number of hydrological drought events was fewer, but they occurred over longer duration and much severe than the meterological one. Severe hydrological drought (SSI 1 = -14.8) in 1997-1998 has declined water storage of Lake Towuti by 90% leading to reduction in Larona hydropower production. Furthermore, our findings provide promising approach to detect hydrological drought that may occur in the near future.
Highlights
Kekeringan merupakan bencana yang berkembang secara perlahan dan sering kali waktu awal dan akhir kejadian kekeringan sulit ditentukan
This study aims to identify the characteristics of hydrological and meteorological drought and to identify meteorological drought propagation to hydrological drought through Larona Watershade
The results showed that duration and severity escalate by the increase in the accumulation period Standardised Precipitation Index (SPI) and Standardised Streamflow Index (SSI)
Summary
Kekeringan merupakan bencana yang berkembang secara perlahan dan sering kali waktu awal dan akhir kejadian kekeringan sulit ditentukan. Kekeringan curah hujan disebut kekeringan meteorologi, kekeringan kelembaban tanah dinyatakan sebagai kekeringan pertanian serta kekeringan air bumi, aliran sungai dan danau yang dikenal dengan kekeringan hidrologi (Tallaksen dan Van Lanen, 2004; Van Loon dan Laaha, 2015). Perhitungan yang sederhana, penggunaan data yang minimal (hanya curah hujan) dan fleksibilitas SPI menjadikan metode ini disarankan World Meteorological Organization (WMO) sebagai indikator yang dipilih untuk memantau kekeringan meteorologi (Hayes et al, 2011). Penelitian ini dilakukan untuk mengidentifikasi kerakteristik kekeringan meteorologi dengan metode SPI dan hidrologi dengan SSI pada DAS Larona, mengenali hubungan kejadian kekeringan hidrologi dan kekeringan meteorologi serta mengidentifikasi pola penjalaran dan perlambatan kekeringan meteorologi menuju kekeringan hidrologi.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management)
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
