Climate Change Impact in Flores Island, a Dry Region in Indonesia


  • Cilcia Kusumastuti Department of Civil Engineering, Petra Christian University
  • Dicky Gode Department of Civil Engineering, Petra Christian University
  • Yobella Febe Kurnianto Department of Civil Engineering, Petra Christian University
  • Frederik Jones Syaranamual Department of Civil Engineering, Petra Christian University



Climate change, dry region, Mann-Kendall’s test, rainfall trend, t-test


Climate change impacts have gained great attention to be studied in various fields. In this paper, an investigation of rainfall pattern change is performed using three statistical methods, i.e., simple linear regression, t-test, and Mann-Kendall’s test. The analysis is performed at 10- and 20-year time scales of daily, monthly, and annual rainfall in Flores Island, a dry region in Indonesia. In general, an increasing monthly rainfall trend is detected in the rainy season (October – April) at a 20-year period, using all three methods. Specifically, a significant increasing trend in March 1989 – 2008 is observed, and it contributes to the significant increasing trend of annual rainfall.  The findings presented in this paper should be an alert for potential climate change impacts in the region. The positive consideration of having more rainfall in a dry region might turn into a negative reality when adaptation measures are not well-prepared.


Houghton, J.T., Filho, L.G.M., Callander, B.A., Harris, N., Kattenberg, A., and Maskell, K., Climate Change 1995: The Science of Climate Change: Contribution of Working Group I to the Second Assessment Report of the Intergovern-mental Panel on Climate Change, Vol. 2, 1996: Cambridge University Press.

Solomon, S., Qin, D., Manning, M., Marquis, M., Averyt, K., Tignor M.M.B., Miller, Jr., H.L.M., and Chen, Z. , Climate Change 2007-the Physical Science Basis: Working Group I Contribution to the Fourth Assessment Report of the IPCC, Vol. 4, 2007: Cambridge University Press.

Aguilar, E., Barry, A.A., Brunet, M., Ekang, L., Fernandes, A., Massoukina, M., Mbah, J., Mhanda, A., do Nascimento, D.J., Peterson, T.C., Umba, O.T., Tomou, M., and Zhang, X., Changes in Temperature and Precipitation Extremes in Western Central Africa, Guinea Conakry, and Zimbabwe, 1955–2006. Journal of Geophysical Research, 114(D2), 2009.

Burn, D.H. and Elnur, M.A.H., Detection of Hydrologic Trends and Variability, Journal of Hydrology, 255(1), 2002, pp. 107-122.

De Luís, M., Raventós, J., González-Hidalgo, J.C., Sánchez, J.R., and Cortina, J., Spatial Analysis of Rainfall Trends in the Region of Valencia (east Spain), International Journal of Climatology, 20(12), 2000, pp. 1451-1469.

Kundu, S.K. and Mondal, T.K., Analysis of Long-term Rainfall Trends and Change Point in West Bengal, India, Theoretical and Applied Clima-tology, 138(3-4), 2019, pp. 1647-1666.

Kusumastuti, C. and Weesakul, S., Rainfall Pattern-Urbanization and Rainfall Pattern Change in Bangkok Metropolitan Administra-tion, GWF Wasser Abwasser, 153(1), 2012, p. 74.

Manton, M.J., Della-Marta, P.M., Haylock, M.R., Hennessy, K.J., Nicholls, N., Chambers, L.E., Collins, D.A., Daw, G., Finet, A., Gunawan, D., Inape, K., Kestin, T.S., Lefale, P., Leyu, C.H., Lwin, T., Maitrepierre, L., Ouprasitwong, N., Page, C.M., Pahalad, J., Plummer, N., Salinger, M.J., Suppiah, R., Tran, V.L., Trewin, B., Tibig, I., and Yee, D., Trends in Extreme Daily Rainfall and Temperature in Southeast Asia and the South Pacific: 1961-1998, International Journal of Climatology, 21(3), 2001, pp. 269-284.

Modarres, R. and da Silva, V.P.R., Rainfall Trends in Arid and Semi-arid Regions of Iran, Journal of Arid Environments, 70(2), 2007, pp. 344-355.

Yepdo Djomou, Z.,Monkam, D., and Lenouo, A., Spatial Variability of Rainfall Regions in West Africa During the 20th Century, Atmospheric Science Letters, 10(1), 2008, pp. 9-13.

Zhang, X., Vincent, X. Z, Hogg, W.D., and Niit-soo, A., Temperature and Precipitation Trends in Canada during the 20th Century, Atmosphere-Ocean, 38(3), 2000, pp. 395-429.

Taschetto, A.S. and England, M.H., An Analysis of Late Twentieth Century Trends in Australian Rainfall, International Journal of Climatology, 29(6), 2009, pp. 791-807.

Panthou, G., Lebel, T., Vischel T., Quantin, G., Sane, Y., Ba, A., Ndiaye, O., Diongue-Niang, A., and Diopkane, M., Rainfall Intensification in Tropical Semi-arid Regions: The Sahelian Case, Environmental Research Letters, 13(6), 2018, pp. 064013.

Kusumastuti, C. and Weesakul, S., Extreme Rainfall Indices for Tropical Monsoon Countries in Southeast Asia, Civil Engineering Dimension, 16(2), 2014, pp. 112-116.

Statistics Indonesia, Statistical Yearbook of Indo¬nesia 2020, 2020, Indonesia: Statistics Indo-nesia.

Sub-directorate of Environment Statistics, Envi-ronment Statistics of Indonesia 2020, 2020, Statistics Indonesia: Indonesia.

Argaman, E., Barth, R., Mosche, Y., and Ben-Hur, M., Long-term Effects of Climatic and Hydro¬logical Variation on Natural Vegetation Produc¬tion and Characteristics in a Semiarid Watershed: The northern Negev, Israel, Science of The Total Environment, 747, 2020, pp. 141-146.

Ogunrinde, A.T., Oguntunde, P.G., Akinwumiju, A.S., and Fasinmirin, J.T., Analysis of Recent Changes in Rainfall and Drought Indices in Nigeria, 1981–2015, Hydrological Sciences Journal, 64(14), 2019, pp. 1755-1768.

Piyoosh, A.K. and Ghosh, S.K., Identification and Analysis of Recent Temporal Temperature Trends for Dehradun, Uttarakhand, India, Meteorology and Atmospheric Physics, 131(4), 2019, pp. 863-882.

Heumann, C., Schomaker, M., and Shalabh, Introduction to Statistics and Data Analysis, 2016, Springer.

Kumar, N., Panchal, C.C., Chandrawanshi, S.K., and Thanki, J.D., Analysis of Rainfall by using Mann-Kendall Trend, Sen’s Slope and Variability at Five Districts of South Gujarat, India, Mausam, 68, 2017, pp. 205-222.

Zhang, Q., Liu, C., Xu, C., Xu, Y., and Jiang, T., Observed Trends of Annual Maximum Water Level and Streamflow during Past 130 Years in the Yangtze River basin, China, Journal of Hydro¬logy, 324(1), 2006, pp. 255-265.

Kallache, M., Rust, H.W., and Kropp, J., Trend Assessment: Applications for Hydrology and Cli¬mate Research, 2005.

Nalley, D., Adamowski, J., Khalil, B., and Ozga-Zielinski, B., Trend Detection in Surface air Temperature in Ontario and Quebec, Canada during 1967–2006 using the Discrete Wavelet Transform, Atmospheric Research, 132-133, 2013, pp. 375-398.

Wang, Y., Youpeng, X. Tabari, H., Wang, J., Wang, Q., Song, S., and Hu, Z., Innovative Trend Analysis of Annual and Seasonal Rainfall in the Yangtze River Delta, Eastern China, Atmos-pheric Research, 2020, 231.

Ghasemi, A.R., Changes and Trends in Maxi-mum, Minimum and Mean Temperature Series in Iran, Atmospheric Science Letters, 16(3), 2015, pp. 366-372.




How to Cite

Kusumastuti, C. ., Gode, D. ., Kurnianto, Y. F. ., & Syaranamual, F. J. . (2021). Climate Change Impact in Flores Island, a Dry Region in Indonesia . Civil Engineering Dimension, 23(1), 20-27.