30/10/2026
𝗠𝗮𝗽 𝗙𝗲𝗮𝘁𝘂𝗿𝗲 #𝟳: 𝗔𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻 𝗼𝗳 𝗚𝗲𝗼𝘀𝗽𝗮𝘁𝗶𝗮𝗹 𝗧𝗲𝗰𝗵𝗻𝗶𝗾𝘂𝗲𝘀 𝗳𝗼𝗿 𝗘𝘀𝘁𝗶𝗺𝗮𝘁𝗶𝗻𝗴 𝗮𝗻𝗱 𝗦𝗶𝗺𝘂𝗹𝗮𝘁𝗶𝗻𝗴 𝗦𝗼𝗶𝗹 𝗘𝗿𝗼𝘀𝗶𝗼𝗻 𝗮𝗻𝗱 𝗦𝗲𝗱𝗶𝗺𝗲𝗻𝘁 𝗬𝗶𝗲𝗹𝗱 𝗶𝗻 𝗠𝗮𝘁-𝗜 𝗖𝗿𝗲𝗲𝗸, 𝗟𝗮𝘀 𝗡𝗶𝗲𝘃𝗲𝘀, 𝗔𝗴𝘂𝘀𝗮𝗻 𝗱𝗲𝗹 𝗡𝗼𝗿𝘁𝗲, 𝗣𝗵𝗶𝗹𝗶𝗽𝗽𝗶𝗻𝗲𝘀
This map feature presents the spatial distribution of soil erosion susceptibility and sediment yield within the 2,721.34-hectare Mat-I Creek watershed in Las Nieves, Agusan del Norte. Using geospatial techniques and hydrological modeling, the study assessed areas vulnerable to soil loss and simulated sediment movement under different rainfall conditions.
Results from the Revised Universal Soil Loss Equation (RUSLE) revealed that the upstream portions of the watershed were the most susceptible to soil erosion. These areas are characterized by higher elevations and steeper slopes, which increase surface runoff and the detachment and transportation of soil particles. The slope length and steepness factor (LS) played a significant role in identifying areas with elevated erosion risks.
Sediment yield modeling using the Modified Universal Soil Loss Equation (MUSLE) further demonstrated how rainfall intensity influences sediment movement throughout the watershed. Under moderate rainfall conditions before Typhoon Odette, the estimated total sediment yield was 596.84 cubic meters, with subbasin W300 recording the highest contribution at 75.44 cubic meters. However, during Typhoon Odette, the total sediment yield increased dramatically to 39,494.48 cubic meters due to extreme rainfall and increased surface runoff.
The sediment yield maps also identified several areas with substantial sediment accumulation during the typhoon. Barangay Tinucoran exhibited the highest sediment yield, while Barangay New Gingoog, Consorcia, and Tagabasi also recorded notably high values. These patterns were associated with factors such as steep terrain, high slope length and steepness values, soil erodibility, and the presence of croplands. Intense rainfall may have further contributed to sediment accumulation and restricted sediment transport in certain parts of the watershed.
Simulation results demonstrated that changes in river width and depth can considerably influence sedimentation patterns. Narrower river channels encouraged sediment accumulation in certain subbasins, while wider channels altered the distribution of sediment yield by affecting water flow and discharge. Although the overall sediment yield remained relatively similar under the simulated geomorphological scenarios, the locations experiencing high sediment accumulation changed considerably.
These findings highlight the importance of understanding the relationship between terrain characteristics, rainfall intensity, and river morphology in assessing soil erosion and sediment yield. The resulting maps provide valuable spatial information for identifying erosion-prone areas, monitoring sediment accumulation, and supporting watershed management and disaster risk reduction initiatives.
Reference:
Asube, L. C. S., Bolanio, K. P., Abenales, S. C., and Arogancia, M. C., “Application of Geospatial Techniques for Estimating and Simulating Soil Erosion and Sediment Yield in Mat-I Creek, Las Nieves, Agusan del Norte, Philippines,” in Proceedings of the 2023 Second International Conference on Advances in Computational Intelligence and Communication, Dec. 2023. https://doi.org/10.1109/ICACIC59454.2023.10435077.
Featured by: Denver John A. Gomez
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