I'm from the area and had always understood that it was put on that specific stretch of beach as a concerted effort to shore up the coastline against erosion, a

I'm from the area and had always understood that it was put on that specific stretch of beach as a concerted effort to shore up the coastline against erosion, as opposed to indiscriminate tipping as the article makes it sound like is the case. It's concentrated to quite a short stretch of the coastline, and the rest of the surrounding beaches don't have any rubble at all. It's very visible on google maps if you're interested in seeing the extent - https://maps.app.goo.gl/QutF47BFeoYpUC6YA https://maps.app.goo.gl/QutF47BFeoYpUC6YA. It extends from just above Crosby beach up to the mouth of the Alt River.