三角洲型河口河海划界

河海界限不是一个固定的断面，受制于径流、潮汐、风暴和地形等自然因素，河水与海水接触处的时空变化大。通过对黄河口和珠江口地区的河海划界的讨论，认为三角洲型的河口区海陆划界不能以咸水内侵、淡水冲出及生态环境等具有明显季节性的特征为依据，而应根据河口三角洲典型的地貌特征、沿着三角洲平原与水下三角洲前缘的界线划分，符合自然特征。

Delimitation Between River and Sea in the Estuary Areas

The river sea boundary line, which is not a fixed line, is controlled by natural factors such as flow, tide, storm and topography. According to the discussion about river sea delimitation in the Pearl River and the Yellow River estuary areas, the boundary lines in the delta areas cannot be defined by seasonal and spatial factors such as the salt water intrusion, the outflow of fresh water and ecological environments. The delta plain and undersea delta front have their own typical natural characters and the boundary line between them is a natural line, and also the best river sea boundary line in the delta estuary areas.