bank banks canal channel fall falls grass lawns river shore stone stones water waterfall waterfalls yard bay shore density early early morning erosion prevention grasses groundcover light Morning plants resilient salt-resistant salt-resistant seaside vegetation sand sandy seaside shadows sunlight variation variety vegetation wind-resistant antenna beach building captain lake marina pond London road spring tamiza thames trees wharf azure beak bill bird birding birds blue coast curlews curved bill estuary feed forage gregarious hunt migratory Migratory Bird Numenius phaeopus ornithology Scolopacidae sea search Shore Bird wader Whimbrel winter Wintering break crash Devon England gravel horizon shingle wave angle angler angling fish fisher fisherman fishing lure ocean rod cliff landscape rock surf tide