PERTANIKA JOURNAL OF SCIENCE AND TECHNOLOGY

BRIS (beach ridges interspersed with swales) wetlands dominate the coastal plains of the east coast of Peninsular Malaysia. This study examined the impact of rainfall and river levels on groundwater hydrodynamics in a coastal BRIS wetland at Universiti Malaysia Terengganu during the northeast monsoon and non-monsoon seasons (July 2022 to January 2023). Six monitoring wells (WA-WF) were built, with WB, WC and WD positioned on the higher ground, whereas WA, WE and WF were on the lower ground. River levels were observed at three stations (R1–R3), rainfall data were collected using a weather station and tidal data were obtained from an existing station. Measurements at 5-minute intervals identified a strong correlation. Between tidal oscillations and river water level (r = 0.7–0.92, average, 0.81), typical of tidal rivers. However, the influence of tidal oscillation on groundwater level was weak (average r = 0.22), suggesting an indirect influence through river dynamics. Groundwater level in lower areas near rivers was more influenced by river water level changes (average r = 0.54, monsoon average = 0.76). In contrast, the higher section showed a weak influence in general (average r = 0.02, monsoon average = 0.34). During monsoon season, increased upstream flows elevated river levels, enhancing hydraulic connectivity across the wetland. Groundwater fluctuations were limited to 0.5 m below ground, with lower areas frequently saturated or inundated, limiting floodwater retention capacity. Future research could explore the impact of soil texture and porosity to refine understanding of BRIS wetland hydrodynamics.

• Abdullahi, M. G., & Garba, I. (2016). Effect of rainfall on groundwater level fluctuation in Terengganu, Malaysia. Journal of Remote Sensing and GIS, 4(2), 142-146. http://dx.doi.rg/10.4172/2169-0049.1000142
  
  Aish, A. (2010). Simulation of groundwater mound resulting from proposed artificial recharge of treated sewage effluent case study - Gaza waste water treatment plant, palestine. Geologia Croatica, 63(1), 67-73.
  
  Ariffin, E. H., Sedrati, M., Akhir, M. F., Norzilah, M. N. M., Yaacob, R., & Husain, M. L. (2019). Short-term observations of beach morphodynamics during seasonal monsoons: Two examples from Kuala Terengganu coast (Malaysia). Journal of Coastal Conservation, 23, 985-994. https://doi.org/10.1007/s11852-019-00703-0
  
  Arrifin, E. H., Sedrati, M., Akhir, M. F., Yaacob, R., & Husain, M. L. (2016). Open sandy beach morphology and morphodynamic as response to seasonal monsoon in Kuala Terengganu, Malaysia. Journal of Coastal Research, (75), 1032-1036. https://doi.org/10.2112/SI75-207.1
  
  Bakar, A. E., Johari, N. N., Ali, Q. A., & Othman, R. (2023). Bris soil: Natural vegetation and potential cultivated plants. In Advantages and Disadvantages of Sandy Soils (pp. 181-207). Nova Science Publishers, Inc.
  
  Cai, Y., Huang, R., Xu, J., Xing, J. T., & Yi, D. (2022). Dynamic response characteristics of shallow groundwater level to hydro-meteorological factors and well irrigation water withdrawals under different conditions of groundwater buried depth. Water, 14(23), Article 3937. https://doi.org/10.3390/w14233937
  
  Curtis, Z. K., Li, S. G., Liao, H. S., & Lusch, D. P. (2017). Data‐driven approach for analyzing hydrogeology and groundwater quality across multiple scales. Groundwater, 56(3), 377-398. https://doi.org/10.1111/gwat.12584
  
  Ensign, S. H. (2013). The effect of tide on the hydrology and morphology of a freshwater river. Earth Surface Processes and Landforms, 38(6), 655-660. https://doi.org/10.1002/esp.3392
  
  Gao, J., Wang, R., Huang, J., & Liu, M. (2015). Application of BMP to urban runoff control using SUSTAIN model: Case study in an industrial area. Ecological Modelling, 318, 177-183. https://doi.org/10.1016/j.ecolmodel.2015.06.018
  
  Gleeson, T., Marklund, L., Smith, L., & Manning, A. H. (2011). Classifying the water table at regional to continental scales. Geophysical Research Letters, 38(5), 1-6. https://doi.org/10.1029/2010GL046427
  
  Hossain, M., Hanafi, M., Jol, H., & Jamal, T. (2011). Dry matter and nutrient partitioning of kenaf (Hibiscus cannabinus L.) varieties grown on sandy bris soil. Australian Journal of Crop Science, 5(6), 654-659.
  
  Hsieh, P., Huang, J., & Wu, M. (2020). Response of groundwater levels in a coastal aquifer to tidal waves and rainfall recharge. Water, 12(3), Article 625. https://doi.org/10.3390/w12030625
  
  Ikbal, I. M., Din, H. H., Tuah, W. H., Jaafar, S. M., Ahmad, N., & Sukri, R. S. (2023). Review: Diversity, structure, and community composition of Bornean heath forest with a focus on Brunei Darussalam. Biodiversitas, 24(5), 2814-2829. https://doi.org/10.13057/biodiv/d240535
  
  Ishaq, U. M., Umara, B., Armanto, M. E., & Arshad, A. M. (2019). Assessment and evaluation of bris soil and its implication on maize crop in Merang-Terengganu Region of Malaysia. Journal of Biology, Agriculture and Healthcare, 4(5), 69-76.
  
  Ismail, N. I., Ariffin, E. H., Yaacob, R., Husain, M. L., & Baharim, N. B. (2020). The impact of seasonal monsoons on the morphology of beaches protected by barrier islands in Setiu, Terengganu, Malaysia. Journal of Sustainability Science and Management, 15(4), 120-129.
  
  Jolly, I., McEwan, K., & Holland, K. L. (2008). A review of groundwater-surface water interactions in arid/semi-arid wetlands and the consequences of salinity for wetland ecology. Ecohydrology, 1(1), 43-58. https://doi.org/10.1002/eco.6
  
  Kamoona, S., Ramya, R., Daud, W., Hatta, F., & Othman, R. (2023). Properties of sandy soil and allelochemical compounds of heath forest in rantau abang, terengganu, malaysia: Implication for ecological sustainability and biodiversity conservation. International Journal of Innovative Research and Scientific Studies, 6(2), 344-357. https://doi.org/https://doi.org/10.53894/ijirss.v6i2.1432
  
  Koh, M. K., Sathiamurthy, E., & Parham , P. R. (2018). Groundwater processes in a sandbar-regulated estuary, Mengabang Telipot, Peninsular Malaysia. Bulletin of the Geological Society of Malaysia, 66, 39-46.
  
  Lah, M. K. C., Nordin, M. N., ISa, M. M., Khanif, Y. M., & Jahan, S. M. (2011). Composting increases BRIS soil health and sustains rice production. Science Asia, 37(4), 291-295. https://doi.org/10.2306/scienceasia1513-1874.2011.37.291
  
  Marwanto, S., Watanabe, T., Iskandar, W., Sabiham, S., & Funakawa, S. (2018). Effects of seasonal rainfall and water table movement on the soil solution composition of tropical peatland. Soil Science and Plant Nutrition, 64(3), 386-395. https://doi.org/10.1080/00380768.2018.1436940
  
  McCleskey, R. B., Nordstrom, D. K., & Ryan, J. N. (2011). Eelectrical conductivity method for natural waters. Applied Geochemistry, 26, S227-S229. https://doi.org/10.1016/j.apgeochem.2011.03.110
  
  Meng, X., Wang, J., Yang, Y., & Yang, L. (2022). Groundwater Response to tide fluctuation and rainfall in coastal reclamation area. Lithosphere, 2022, Article 6294524. https://doi.org/10.2113/2022/6294524
  
  Mitsch, W. J., & Gosselink, J. G. (2015). Wetland. John Wiley and Sons.
  
  Moffett, K. B., Gorelink, S. M., Mclaren, R. G., & Sudicky, E. A. (2012). Salt marsh ecohydrological zonation due to heterogeneus. Water Resources Research, 48(2). https://doi.org/10.1029/2011WR010874
  
  Mohamad, I. C., Samsudin, A. R., & Rafek, A. G. (2002, May 26-27). Perubahan fasies hidrokimia dalam akuifer aluvium pantai: Kajian kes di kawasan Pekan-Nenasi, Pahang. In Geological Society of Malaysia Annual Geological Conference (pp. 23-30). Kelatan, Malaysia.
  
  Othman, M. A., Ghani, A. A., & Othman, M. S. A. (2020). Distribution of rainfall events in northern region of Peninsular Malaysia. In IOP Conference Series: Earth and Environmental Science (Vol. 476, No. 1, p. 012116). IOP Publishing. https://doi.org/10.1088/1755-1315/476/1/012116
  
  Pang, Z., Huang, T., & Chen, Y. (2009). Diminished groundwater recharge and circulation relative to degrading riparian vegetation in the middle Tarim River, Xinjiang Uygur, Western China. Hydrological Processes, 24(2), 147-159. https://doi.org/10.1002/hyp.7438
  
  Pirani, F. J., & Najafi, M. R. (2020). Recent trends in individual and multivariate compound flood drivers in Canada’s coasts. Water Resources Research, 56(8). https://doi.org/10.1029/2020WR027785
  
  Revitt, M., Ellis, B., & Lundy, L. (2017). Assessing the impact of swales on receiving water quality. Urban Water Journal 14(8), 839-845. https://doi.org/10.1080/1573062X.2017.1279187
  
  Roslan, I. J. (2010). Occurrence and properties of soils on sandy beach ridges in the Kelantan Terengganu plains, peninsular Malaysia. Catena, 83(1), 55-63. https://doi.org/10.1016/j.catena.2010.07.004
  
  Salim, J. M., Nur-Faiezah, A. G., Kehirah, A. S., Nowal, M., & Salam, M. R. (2014). Woody plants on dune landscape of Terengganu, peninsular Malaysia. Journal of Tropical Forest Science, 26(2), 267-274.
  
  Sathiamurthy, E., Min, K. K., Ishak, M. Z., Nagappan, L., & Chuen, Y. J. (2021). Rainfalls and salinity effects on fecal coliform Most Probable Number (MPN) Index distribution in a beach ridge-shore ridge system in Mengabang Telipot, Terengganu, Malaysia. Bulletin of the Geological Society of Malaysia, 71, 203-213.
  
  Sathiamurthy, E., & Pauzi, N. S. (2020). Flow velocity model for a coastal estuarine sandbar using multivariate regression. Bulletin of the Geological Society of Malaysia, 69, 89-95.
  
  Toriman, M. E., Mokhtar, M., Gazim, M. B., & Aziz, N. A. A. (2009). Analysis of the physical characteristics of bris soil in coastal Kuala Kemaman, Terengganu. Environmental Science, Geography, 1(1), 1-6.
  
  Touchette, B. W., Adams, E. C., Laimbeer, P., & Burn, A. G. (2011). Ridges crest versus swale: Contrasting plant-water relations and performance indexes in two understory plant species in a coastal maritime forest. Journal of Plant Interactions, 7(3), 271-282. https://doi.org/10.1080/17429145.2011.603061
  
  Westra, S., Fowler, H. J., Evans, J. P., Alexender, L. P., Berg, P., Johnson, F., Kendon, E.J., Kenderik, G., & Roberts, N. M. (2014). Future changes to the intensity and frequency of short-duration extreme rainfall. Reviews of Geophysics, 52(3), 522-555. https://doi.org/ https://doi.org/10.1002/2014RG000464
  
  Wetland International. (2010). A Quick Scan of Peatlands in Malaysia. Wetlands International Malaysia.
  
  Wilopo, W., & Putra, D. P. (2021). Groundwater recharge estimation using groundwater level fluctuation patterns in unconfined aquifer of yogyakarta city, indonesia. Kuwait Journal of Science, 48(2). https://doi.org/10.48129/kjs.v48i2.9397
  
  Xu, C., Sun, Y., Shi, B., Wang, X., Li, R., Li, M., Xi, B., & Feng, C. (2022). Study on the processes influencing and importance of ecological water replenishment for groundwater resources: A case study in yongding river. Water, 14(5), Article 828. https://doi.org/10.3390/w14050828
  
  Zakaria, N. H., Nordin, M. S., Ibrahim, M. A., Majid, F. A., & Zainuddiin, Z. (2023). Genetic diversity and proteomic analysis of vegetable soybean [Glycine max (L.) Merrill] accessions grown in mineral and BRIS soils. Czech Journal of Genetics and Plant Breeding, 59(1), 14-22. https://doi.org/10.17221/38/2022-CJGPB
  
  Zhang, X., Jiao, J. J., & Guo, W. (2022). How does topography control topography‐driven groundwater flow? Geophysical Research Letters, 49(20). https://doi.org/10.1029/2022GL101005
  
  Zhang, Y., & Najafi, M. R. (2020). Probabilistic numerical modeling of compound flooding caused by tropical storm matthew over a data‐scarce coastal environment. Water Resources Research, 56(10). https://doi.org/10.1029/2020WR028565