The current gardens are a relatively modern addition and much reconstruction work of existing structures had been done to tidy its appearance; however, upon closer inspection some of these structures formed ‘keyhole’ shapes in plan, typical of kilns or furnaces.
Prof Kate Welham and Dr Derek Pitman from Bournemouth University took the lead in May, undertaking a non-invasive survey of an area of garden using a whole suite of geophysical techniques (fluxgate gradiometer, electromagnetic survey, magnetic susceptibility and ground penetrating radar (GPR)), plus portable X-ray fluorescence (p-XRF). This approach was taken because of the likely nature of deposits beneath the surface – the site had been occupied by Napoleon’s forces during the Peninsular War, but upon his retreat significant parts of the fortress were destroyed including, most probably, the area of garden under survey. As little or no archaeological work had been carried out before, no one knew quite what to expect.
Now, my first piece of archaeological fieldwork took place in 2000, and I’ve been in and out of the field ever since, but until this moment I’d never performed a geophysical survey. I’d always been that guy who can dig and, in more recent years, the GIS geek, often working with geophysical data but never collecting it. So just to prove to everyone that it did actually happen I got someone to capture the moment…
I’m afraid I’m not able to reproduce the results in this blog, but I can say that several areas indicated the presence of high temperature activities. These results informed the implementation of an excavation strategy, and a couple of months later, two trenches were opened to investigate various magnetic enhancements recorded during the geophysical survey. These were directed by Dr Chloe Duckworth from Newcastle University and Dr Alberto Garcia Porras from University of Granada, and I was invited along to survey their findings and introduced them to the use of SfM to reconstruct a 3-dimensional image of each trench.
It was their first digging field season and the main priority was to take the topsoil off and map the uppermost deposits and any structural remains. Once this had been achieved it became increasingly apparent that the site was more complex than first thought. It had been occupied on and off for the past 800 years and many of the remains date to later activity, including the modern reconstructions which now mask the true nature of the kilns.
I hope to return in 2017 when these remains can be investigated fully and the full extent of production within the Alhambra is likely to reveal itself.