图1. 黄河流域研究区概况及其二级水资源分区Ⅰ:龙羊峡以上;Ⅱ:龙羊峡至兰州;Ⅲ:兰州至头道拐;Ⅳ:头道拐至龙门;Ⅴ:龙门至三门峡;Ⅵ:三门峡至花园口;Ⅶ:花园口以下;Ⅷ:内流区
Fig.1. Location of Yellow River Basin and its Secondary divisions of water resources