MAY 30 — When people think about landslides, they usually think about the moment the slope collapses. The damaged roads, buried vehicles, fallen retaining walls, or evacuation efforts that follow. What is less visible is the work that happens long before that point, especially the effort required to monitor slopes continuously in difficult environments.

Over the past few years, I have spent a significant amount of time working on slope monitoring systems using optical fibre sensors at the Photonics Research Centre, Universiti Malaya (PRCUM). Much of this work involves field installations in areas exposed to rain, unstable ground conditions, and limited accessibility. One thing I learned fairly quickly is that collecting reliable data outdoors is often much harder than developing the sensor itself.

In many cases, monitoring systems are expected to operate continuously in places where maintenance access is limited. Some locations are exposed to heavy rainfall almost every day. Others are vulnerable to lightning strikes, unstable terrain, fallen trees, interrupted power supply, or poor network connectivity. Even installing cables safely can become a challenge depending on the condition of the slope.

These realities forced us to think less about laboratory performance and more about long-term practicality.

At PRCUM, optical fibre research has been ongoing for decades under the leadership of Datuk Distinguished Professor Harith Ahmad. Over time, the research expanded beyond telecommunications and laboratory optics into sensing applications that could be used in real engineering environments. My own work grew from this larger research ecosystem, particularly in exploring how optical fibre sensors could be adapted for slope monitoring and ground movement detection.

One reason optical fibre sensing attracted our attention is because the sensing point itself does not require active electronic components. Instead of relying heavily on electronics in the field, the system uses light travelling through optical fibres to detect changes such as tilt, displacement, or pressure.

From an engineering perspective, this brings several practical advantages.

In outdoor environments, especially in tropical countries like Malaysia, electronics are often the first components to fail after prolonged exposure to moisture, heat, or electrical surges. By reducing the dependence on electronics at the sensing point, the system becomes more resilient to environmental disturbances such as lightning and electromagnetic interference. This is particularly important for installations located on exposed slopes or remote areas where maintenance work can be difficult and time-consuming.

At the same time, the system allows data to be monitored remotely and continuously without requiring personnel to repeatedly enter potentially hazardous zones.

Our field deployments over the years taught us many lessons that cannot be obtained from laboratory experiments alone.

One of the more important projects involved installing sensors in Blue Valley, Cameron Highlands, in collaboration with Pintas Utama Sdn Bhd. The site became an important testing ground because it exposed the system to actual terrain and environmental conditions. We had to think carefully about cable routing, weather protection, installation stability, power supply, and remote data transmission. Some solutions worked well immediately. Others required multiple rounds of adjustment after spending time on-site. And that process of refinement is still ongoing.

Additional monitoring systems were later installed at several locations within the Universiti Malaya campus, including areas near the Faculty of Medicine and the Academy of Malay Studies. These installations helped us observe how the sensors behaved over longer periods under changing weather conditions and nearby construction activities.

One thing that became increasingly clear to me throughout this work is that slope monitoring should not be viewed purely as a reactive measure after an incident occurs. The larger value lies in observing gradual changes over time. Small ground movements may not appear dangerous initially, but long-term monitoring can sometimes reveal patterns that deserve closer attention before the situation worsens.

Of course, no single monitoring technology can solve every problem on its own. Optical fibre sensors are not meant to replace all existing systems. Technologies such as LiDAR, rain gauges, and geotechnical instruments still play important roles depending on the site and application. In practice, effective slope management often depends on combining multiple sources of information rather than relying on a single method.

Still, I believe there is growing value in developing local monitoring technologies that are designed around Malaysian conditions instead of depending entirely on imported systems.

Malaysia’s terrain, weather patterns, and infrastructure challenges are unique enough that practical adaptation matters. Systems that work well in controlled environments overseas may require significant modification before they can operate reliably on tropical slopes exposed to constant rainfall and difficult maintenance conditions.

For researchers and engineers working in this area, the goal is not simply to build sophisticated sensors. The more important challenge is building systems that continue functioning reliably months and years after installation, often in places where nobody wants to stand during heavy rain.

In the end, some of the most useful engineering solutions are not necessarily the most visible ones. They simply continue working quietly in the background, collecting information consistently, and helping us respond earlier before small ground movements turn into larger disasters.

* The author is the Research Officer at the Photonics Research Centre, Universiti Malaya, and may be reached at syamilsaad@um.edu.my 

** This is the personal opinion of the writer or publication and does not necessarily represent the views of Malay Mail.