Long-Term Rainfall Variability and Seasonal Shifts in Relation to Pranatamangsa in the Rongkop Karst Region, Indonesia

Authors

  • Qonaah Rizqi Fajriani Department of Civil Engineering and Planning, Faculty of Engineering, Universitas Negeri Yogyakarta, Yogyakarta 55281, Indonesia
  • Suwartanti Nayono Department of Civil Engineering and Planning, Faculty of Engineering, Universitas Negeri Yogyakarta, Yogyakarta 55281, Indonesia
  • Satoto Endar Nayono Department of Civil Engineering and Planning, Faculty of Engineering, Universitas Negeri Yogyakarta, Yogyakarta 55281, Indonesia
  • Didik Purwantoro Department of Civil Engineering and Planning, Faculty of Engineering, Universitas Negeri Yogyakarta, Yogyakarta 55281, Indonesia

DOI:

https://doi.org/10.21831/inersia.v22i1.95431

Keywords:

Rainfall variability, Pranata mangsa, karst region, extreme precipitation, seasonal onset

Abstract

Climate change has altered rainfall characteristics and seasonal patterns. This matter affects mostly rainfed agricultural systems in karst regions. This study aims to analyze rainfall characteristics, extreme rainfall events, seasonal shifts, and the reliability of traditional seasonal knowledge (pranata mangsa) in the Rongkop karst area, Indonesia. The dataset used in this study are long-term daily rainfall data from Rongkop stations for the period 1986–2021. The rainfall data then convert to dasarian (10-day) temporal resolution. The daily rainfall was classified into intensity categories, while seasonal onset was determined based on rainfall thresholds. Trend analysis was conducted using the Mann–Kendall test and Sen’s slope estimator. The results indicate that Rongkop has moderate annual rainfall, with an average of 2012 mm, and no significant trend in total rainfall. However, there is a significant increase in the frequency of heavy rainfall events (>50 mm/day), indicating a shift towards higher rainfall intensity. Seasonal analysis shows variability in the onset of the rainy season between late August and late December, and the dry season between early February and mid-May. Seasonal duration also varies significantly, with extended dry spells and increased rainfall during the dry season. The results indicate increasing inconsistencies between traditional and observed rainfall patterns, with very high rainfall occurring during the dry season and very low rainfall during the wet season. The onset of the wet and dry seasons also exhibits significant variability beyond the expected seasonal boundaries. These findings suggest that although traditional seasonal forecasts (pranatamangsa) still reflect general climate patterns, their reliability for agricultural planning has declined due to increasing rainfall variability, extreme events, and large-scale climate phenomena such as El Niño and La Niña, particularly in rainfed karst areas. Therefore, integrating traditional seasonal knowledge with modern climatological analysis is crucial to support adaptive agricultural management, particularly in karst areas.

References

[1] A. Varga, “Climate change and its impact on agriculture,” Acta Hortic. Regiotect., vol. 24, no. s1, 2021, doi: 10.2478/ahr-2021-0010.

[2] J. P. Aryal, T. B. Sapkota, R. Khurana, A. Khatri-Chhetri, D. B. Rahut, and M. L. Jat, “Climate change and agriculture in South Asia: Adaptation options in smallholder production systems,” Environ. Dev. Sustain., vol. 22, no. 6, 2020, doi: 10.1007/s10668-019-00414-4.

[3] K. Yulianto, “Agroekologi: Model pertanian berkelanjutan masa depan,” J. Tambora, vol. 1, no. 3, 2016, doi: 10.36761/jt.v1i3.142.

[4] World Meteorological Organization, Global Climate Report—August 2020: State of the Climate. Geneva, Switzerland: WMO, 2020.

[5] S. A. Woznicki, A. P. Nejadhashemi, and M. Parsinejad, “Climate change and irrigation demand: Uncertainty and adaptation,” J. Hydrol. Reg. Stud., vol. 3, pp. 247–264, Mar. 2015, doi: 10.1016/j.ejrh.2014.12.003.

[6] G. Fischer, F. N. Tubiello, H. van Velthuizen, and D. A. Wiberg, “Climate change impacts on irrigation water requirements: Effects of mitigation, 1990–2080,” Technol. Forecast. Soc. Change, vol. 74, no. 7, pp. 1083–1107, Sep. 2007, doi: 10.1016/j.techfore.2006.05.021.

[7] E. Rasmikayati, B. R. Saefudin, D. Rochdiani, and R. S. Natawidjaja, “Dinamika respon mitigasi petani padi di Jawa Barat dalam menghadapi dampak perubahan iklim serta kaitannya dengan pendapatan usaha tani,” J. Wil. Lingkung., vol. 8, no. 3, pp. 247–260, Dec. 2020, doi: 10.14710/jwl.8.3.247-260.

[8] V. Gitz, A. Meybeck, L. Lipper, C. Young, and S. Braatz, Climate Change and Food Security: Risks and Responses. Rome, Italy: Food and Agriculture Organization of the United Nations, 2016.

[9] A. B. Sekaranom, E. Nurjani, and F. Nucifera, “Agricultural climate change adaptation in Kebumen, Central Java, Indonesia,” Sustainability, vol. 13, no. 13, Art. no. 7069, 2021, doi: 10.3390/su13137069.

[10] Y. K. Khotimah, S. Supardi, and E. Antriyandarti, “Pemanfaatan sumber daya pertanian lahan kering di Pegunungan Karst Gunungkidul,” in Proc. Semin. Nas. Sumber Daya Pertan. Berkelanjutan dalam Mendukung Ketahanan dan Keamanan Pangan Indones. pada Era Revolusi Ind. 4.0, vol. 3, no. 1, 2019, pp. 50–57.

[11] Direktorat Jenderal Cipta Karya, Rencana Terpadu & Program Investasi Infrastruktur Jangka Menengah Kabupaten Gunungkidul 2015–2019. Yogyakarta, Indonesia, 2014.

[12] N. Daldjoeni, “Pranatamangsa, the Javanese agricultural calendar—Its bioclimatological and sociocultural function in developing rural life,” Environmentalist, vol. 4, suppl. 7, pp. 15–18, 1984, doi: 10.1007/BF01907286.

[13] D. N. Azizah, E. Banowati, Juhadi, and R. Hayati, “Intercropping as a farmer adaptation strategy during drought: A case study of Karangwuni and Semugih Sub-districts, Gunungkidul,” JPG (J. Pendidik. Geogr.), vol. 13, no. 1, 2026, doi: 10.20527/jpg.v13i1.24481.

[14] R. D. Handayani, Z. K. Prasetyo, and I. Wilujeng, Pranata Mangsa dalam Tinjauan Sains. Indonesia: CV. Calina Media, 2018.

[15] A. A. Satriaji, “Pranata Mangsa,” SCLM17, Mar. 2016. [Online]. Available: https://sclm17.blogspot.com/2016/03/pranata-mangsa.html. [Accessed: Feb. 12, 2026].

[16] A. Cahyadi et al., “Rainfall variability in Gunung Sewu karst area, Java Island, Indonesia,” Indones. J. For. Res., vol. 8, no. 1, pp. 23–35, 2021, doi: 10.20886/IJFR.2021.8.1.23-35.

[17] Z. He, X. Gu, F. Qiu, M. Wang, M. Xu, and S. Chen, “Spatiotemporal variability of rainfall in central Guizhou: Multi-time scale analysis and implications for climate change adaptation,” J. Clim. Change, vol. 11, no. 2, pp. 226–243, 2025.

[18] M. K. Zaki, K. Noda, K. Ito, K. Komariah, S. Sumani, and M. Senge, “Adaptation to extreme hydrological events by Javanese society through local knowledge,” Sustainability, vol. 12, no. 24, Art. no. 10373, 2020, doi: 10.3390/su122410373.

[19] Sumani, Suntoro, Komariah, and Mujiyo, “Existences and perception of Javanese local knowledge for climate change adaptation,” IOP Conf. Ser.: Earth Environ. Sci., vol. 824, no. 1, Art. no. 012075, 2021, doi: 10.1088/1755-1315/824/1/012075.

[20] H. O. Salsabila, “The existence of Pranata Mangsa calendar in the midst of global climate change,” in Proc. Int. Conf. Sharia Law (ICOSLAW), vol. 1, no. 1, 2022, pp. 85–89.

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Published

2026-08-12

How to Cite

Fajriani, Q. R., Nayono, S., Nayono, S. E., & Purwantoro, D. (2026). Long-Term Rainfall Variability and Seasonal Shifts in Relation to Pranatamangsa in the Rongkop Karst Region, Indonesia. INERSIA Lnformasi Dan Ekspose Hasil Riset Teknik Sipil Dan Arsitektur, 22(1), 116–127. https://doi.org/10.21831/inersia.v22i1.95431

Issue

Vol. 22 No. 1 (2026): May

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Articles

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Copyright (c) 2026 Qonaah Rizqi Fajriani, Suwartanti Nayono, Satoto Endar Nayono, Didik Purwantoro

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