A relatively new concrete slipway for launching boats, nevertheless it has become covered in a thick mat of algae.
This is adjacent to the Riverside Museum in Glasgow, where the River Kelvin flows into the River Clyde. Despite a long wait for the heatwave we are currently experiencing, we have had very little rain recently in the West of Scotland. The water level at low tide was the lowest I think I have ever seen the Clyde in Glasgow, with several parts of the quay walls exposed right down to the river bed.
The prevalence of this algae is caused by a combination of agricultural fertilizers/ other nutrients washed downstream and prolonged dry weather. I am not sure what this exact species is so if anyone knows please do comment with the scientific name.