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This research aimed at using 3D Terrestrial Laser Scanner to investigate and monitor the morphological changes of rills in and estimate the volume of soil losses from large rills. In this study, the researchers selected six rills on hillslopes with slope gradient ranging between 30-60 % under oil palm and rubber plantations in Tha Sae District, Chumphon Province. Terrestrial Laser Scanner was used to collect 3D morphological characteristics of rills, covering the area of 2 x 5 m2 for each rill. Rills development was monitored between July - December 2018 of which eight data sets in total were obtained per rill. Digital elevation model (DEM) was generated for each observation with 1-cm resolution. Results showed that soil loss from rills under rubber plantation was greater than that under para-rubber plantation. The amounts of soil eroded from the rills under para-rubber plantation were 1,234 (Rubber A), 1,508 (Rubber B) and 1,290 (Rubber C) cm3 over the study period. The amounts of soil loss of 1,244 (Palm A) and 1,203 (Palm B) cm3 of soils were removed from two rills under oil palm plantation, in which one rill gained 0.63 (Palm C) cm3 of removed soil. The rills with the highest Stream Power Index (SPI) under both plantations had the highest net soil loss. The net soil loss was positively correlated with raining day (r = 0.69) in all rills, except the largest rill under oil palm plantation, in which the net soil loss had a positive correlation with maximum rainfall intensity (r = 0.98).
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