bay shore density early early morning erosion prevention grass grasses groundcover light Morning plants resilient salt-resistant salt-resistant seaside vegetation sand sandy seaside shadows shore sunlight variation variety vegetation wind-resistant abstract angles backdrop background barrier bolders boulders cemented coated concrete constructed cover covered erosion-prevention fitted hill mortar perspectives random randomly-coursed Rendered retaining-rocks retaining-wall rock rocks rocky rough rugged secure security slope sloping solid stone stone-walled stones stonework strength strong surface surfaces texture textures uneven variations wall walled well-built