This study focuses on the effect of soil shear strengthdue to the shoreline changes in Batu Pahat Coastal Area. The shorelines of Pantai Punggur were chosen as the subject location for this investigation on soil shear strength and shoreline changes of eroded areas in Batu Pahat, Johor. Pantai Punggur is situated on the west coast of Johor, with a latitude of 1.62° to 1.87° N and a longitude of 102.78° to 103.19° E. Aerial photographs and field observation data were used to determine the geomorphological components of the Pantai Punggur shoreline using an unmanned aerial vehicle (UAV). The study conducted is to produce shoreline changes mapping diagram and analysis soil shear strengths across different sampling locations were measured and correlate with shoreline changes at zones A, B, C, D and E. The aerial image that has been captured by the drone was analyzed using Pix4D and Global Mapper software. Based on the data of shoreline changes zone A portrays the highest changes followed by zone B and C. As for zone D and E its shows quite a small change. Within one month interval, Pantai Punggur coastline experiences changes in about 1.57 meters. From the undrained shear strength test at 0.5 m depth at HT and MT data for December 2021, zone A with Cu reading are more than 4.5 kPa followed by zones B, C, D and lowest at zone E. Next, at depth 0.5 m and 1.0 m data for December 2021 at HT level, zone A with Cu reading is more than 4.5 kPa at the 0.5 m and 1.0 m depth and other zones are below than 3.0 kPa. The depth of soil also influences the data of this study. The correlation of changes in soil shear strength with shoreline changes is reported to have a linear correlation with R2 value is 0.9261. It can conclude that the effect of soil shear strength on shoreline changes at Batu Pahat coastal area cause by the changes in soil shear strength (Cu) gives a large effect of shoreline changes.

This research focused on identifying of beach profile and shoreline sediment properties in the eroded area in Batu Pahat. Pantai Punggur was selected to study the stated parameters due to the condition of this beach which was assigned as an eroded area. The objective of this research is to study the beach profile and shoreline sediment properties in the shoreline area. Shoreline sediment properties were identified by carrying out several testing on the soil sample, whereas, the analysis of the beach profile was done by processing the aerial image in Pix4D Mapper and Global Mapper Software. Throughout the research, a profile change occurred within a few weeks of the study period. Based on the results, the minimum and maximum average moisture content ranged between 70.1-122.6%, whereas the specific gravity data lay within 2.54 to 2.78. The plastic limit (PL) is between 36% and 46%, while the liquid limit (LL) is between 69% and 132%. As for the particle size distribution, the percentage of sand was higher at HT (High Tide) and the percentage of silt was dominant at MT (Mid Tide) in each coastal zone. The significance of the beach profile study and shoreline sediment properties was to help in predicting the erosion behavior occurring in the coastal area.