Meteorological and Hindcast Data-Based Evaluation of Hybrid Wind–Wave Energy Potential Using WECI for Optimal Site Selection in Oman Sea

Imagine the ocean not just as a giant body of water, but as a chaotic, churning dance floor. Sometimes the music is a gentle, rhythmic sway; other times, it's a frantic, high-energy mosh pit. For decades, scientists have tried to tap into this dance to generate electricity, but they've mostly looked at two separate dancers: the wind and the waves. Wind turbines catch the breeze, while wave machines bob with the swells. But here's the catch: the wind and waves don't always dance to the same beat. Sometimes the wind is howling while the sea is calm, or the waves are crashing while the air is still. This mismatch makes it hard to build a reliable power plant that works all the time.

To solve this, researchers are starting to look for "hybrid" spots where both the wind and the waves are doing their best moves at the same time. It's like finding a party where the DJ is perfect and the crowd is energetic simultaneously. To do this, they need a way to measure not just how strong the energy is, but how consistent it is. If the energy comes in a steady, predictable rhythm, engineers can build machines that are efficient and cheap. If the energy is scattered and unpredictable, the machines might break or waste money. This paper dives into a specific corner of the ocean—the Oman Sea—to see if it's the perfect party venue for a hybrid wind-and-wave power station.

---

The Ocean's Energy Hunt: Finding the Perfect Dance Floor

In the Middle East, where the sun is bright and the sea is vast, scientists Madjid Abbaspour and Amir Farshforoush Imani are on a treasure hunt. But instead of gold, they are looking for the perfect spot to build a hybrid energy station that captures power from both the wind and the waves. They focused their search on the Oman Sea, a stretch of water bordering Iran and Oman, using a massive digital time machine to look back at thirty years of weather history.

Think of the ocean's energy like a giant, invisible battery. To charge it up, you need two things: a strong push from the wind and a big, rolling swell from the waves. The problem is, nature is messy. Sometimes the wind blows hard but the waves are tiny; other times, huge swells roll in from far away while the air is still. If you build a wind farm in a spot where the wind is fickle, or a wave farm where the waves are scattered, your energy output will be all over the place. You need a location where the wind and waves are "clumped" together—where the best conditions happen frequently and in a predictable pattern.

To find these "clumped" spots, the researchers invented a new tool called the Wave Energy Concentration Index (WECI). Imagine you are trying to find the best spot to set up a lemonade stand. You could look at a map and see that it rains a lot in a city, but if the rain is scattered all over the city, you might get wet and miss the customers. But if the rain falls in one specific, concentrated neighborhood every Tuesday, you know exactly where to stand. The WECI is like a "rain radar" for wave energy. It measures how tightly packed the high-energy waves are. A high score means the waves are hitting the same spot with the same rhythm over and over again, which is a dream come true for engineers trying to design efficient machines.

The team didn't just guess; they used a super-advanced computer model called ECMWF ERA5. Think of this as a giant, high-definition movie of the weather from 1995 to 2024. It's so detailed that it can show you the wind speed and wave height for every hour of those thirty years. Before trusting this digital movie, they checked it against real-life measurements from buoys and other studies, making sure the simulation was accurate enough to be called "Class 2" reliable. Once they were sure the data was good, they started scanning the coastlines of Iran and Oman.

They narrowed their search down to four potential "party spots," labeled A, B, C, and D.

• Point A (Darak) and Point B (Bandar-e Tang) are on the southeastern coast of Iran.
• Point C (Chabahar) is also on the Iranian coast, further east.
• Point D (Sur) is on the eastern coast of Oman.

When they ran the numbers, a clear winner emerged. While the Iranian spots (A, B, and C) had some good waves, the wind there was a bit of a scatterbrain, blowing from many different directions with varying strength. It was like a party where the music changes genres every five minutes.

Point D, Sur, in Oman, was different. The data showed that Sur had a "concentrated" wind pattern. The wind blew mostly from the north and south with high intensity, and the waves were tightly clustered in their timing and direction. In fact, Sur had the highest WECI score of all the locations, meaning its energy was the most consistent and predictable. The wind rose diagrams (which look like flower petals showing wind direction) showed that Sur's wind was focused, while the Iranian sites were more spread out.

The researchers also looked at how the energy changed with the seasons. They found that while some spots had huge waves in the summer monsoon, they were quiet in other seasons. Sur, however, showed a strong potential for hybrid systems because its wind and wave patterns complemented each other well. The wind was strong and steady in the summer, and the waves were reliable enough to keep the machines humming.

One interesting finding was about the type of waves. At Chabahar (Point C), the waves were mostly "swells"—huge, long waves that traveled from far away. These were stable but didn't have the highest wind power. At Sur (Point D), the waves were a mix of swells and waves generated by the local wind. This local wind action made the wind power density higher, which is great for wind turbines. The study suggests that because the wind at Sur is so consistent and strong, and the waves are concentrated, it is the most promising candidate for a hybrid wind-wave farm.

The paper doesn't claim that building a power plant there is a guaranteed success story yet. It's a feasibility study, meaning it's a "green light" for further investigation. The authors emphasize that while the energy potential looks great on the computer, real-world factors like the cost of building, the environmental impact, and the specific design of the machines still need to be figured out. They also noted that the data showed some long-term trends, like a slight decline in wave power density over the 30 years, which is something future engineers will need to keep an eye on.

In short, this study used thirty years of weather history and a new "concentration calculator" to tell us that the coast of Oman, specifically around Sur, is the most likely place to find a reliable, hybrid wind-and-wave energy party. It's a place where the wind and waves seem to agree on the rhythm, offering a solid foundation for the future of renewable energy in the region. The door is open for more detailed studies to see if we can finally plug into this oceanic power source.