水彩时间演变分析图：河流岸线

时间演变分析图，多阶段并列，主体为河流岸线，统一俯视轴测，柔和的水彩插画风格，轻盈的晕染，纸张纹理，清冷蓝灰配色，浅灰蓝到深海军蓝，同一视角的多个阶段并列排列，底部时间轴，每个阶段新增的部分用强调色高亮，构图简洁，信息层级清晰，大量留白，画面中不出现文字和标注，高清，适合设计展板

historical evolution diagram with stages side by side of a river shoreline, consistent top-down axonometric view, soft watercolor illustration, gentle washes, visible paper texture, cool blue-grey palette from pale grey blue to deep navy, several stages of the same area arranged side by side from the same viewpoint, timeline along the bottom, newly added parts highlighted in accent color, clean composition, clear visual hierarchy, generous white space, no text or labels in the image, high resolution, architecture presentation board