公園ゾーニング：アクティビティ、騒音、バッファー

Create a zoning diagram for a park, drawn as a flat analytical plan. Show the site as a plain outline with only the boundary and the main paths indicated in thin grey. Overlay the zones as flat translucent colour fields with soft edges, one per activity type — active sport, children's play, quiet contemplation, communal gathering, ecological habitat — each labelled centrally in clean sans-serif. Detail the buffers between incompatible zones as hatched bands with a note of the separation distance and what provides it, such as a planted bund or a tree belt. Show a sound gradient as concentric dashed contours radiating from the noisiest zone, labelled with decibel values, so the buffering logic is verifiable. Add small icons within each zone indicating its primary users. Detail a legend listing every zone with its colour, area and share of the total. Keep it flat with generous white space. Diagram style, white background, no shadows, no perspective, no photorealism.