Domain: Natural Science — Marine Science
Target concept: Satellite time-lapse images of algal bloom dispersion in coastal waters

Video generation prompt: Satellite time-lapse imagery from above shows the spread of a phytoplankton bloom across coastal waters over several days.

Evaluation guide:
(i) Target concept: Satellite-observed, time-resolved advection of a biologically driven surface discoloration (phytoplankton bloom) across dynamically constrained coastal waters.
Minimum mechanism: Coastal water body must be bounded by land; bloom must originate in water (not air/land); bloom expansion must occur exclusively over water surface; movement must follow contiguous, irreversible, directional progression consistent with passive tracer transport.
(ii)Storyline: Frame 1: Stable overhead view of coastal zone with clear land-water boundary; bloom appears as compact, high-concentration greenish patch near shore (e.g., estuary). Frame 2–3: Bloom begins expanding outward: edges remain connected to origin, extending along dominant surface flow direction; water texture remains coherent. Frame 4–5: Bloom covers larger water area, retaining diffuse, irregular margins; no portion retreats, fragments, or crosses shoreline; land boundary unchanged; lighting and perspective fully stable throughout.

Manual:
Experimental Procedure
1. Acquire time-synchronized satellite imagery of a coastal region over 3–5 consecutive days.
2. Georegister and composite images to fixed overhead view with stable shoreline reference.
3. Enhance chlorophyll-a signature to visualize phytoplankton concentration as color-coded surface discoloration.
Observation of Experimental Phenomena
A distinct greenish-to-teal discoloration appears initially near a nutrient-rich coastal zone (e.g., river mouth or upwelling site) and progressively expands outward over water — maintaining contiguous, fluid boundaries and never crossing onto land.
Summary of Experimental Principles
Phytoplankton blooms disperse via ocean currents and wind-driven surface advection; their spectral signature in satellite data correlates with chlorophyll-a concentration; time-lapse visualization reveals transport pathways and residence time in coastal waters.

Prompt Grounding rubric:
level_1: No top-down satellite-style view of a coastline appears; no coastal water body is shown; no phytoplankton bloom patch appears at any point; or the whole sequence is really a single still image with no change over time at all.
level_2: An overhead view is present but is tilted or shot from a low, ground-level angle rather than a true top-down satellite perspective; the water body is shown with no adjoining shoreline or land to mark it as a coastal scene; or a bloom-like green patch appears but stays completely identical in shape, size, and position across every frame, so no actual bloom-spread sequence is depicted.
level_3: A top-down, satellite-style view shows a coastal water body with a visible shoreline and adjacent land, a distinctly colored bloom patch sits within the water, and the patch's extent in the closing frame is visibly different from its extent in the opening frame, establishing that the required before/after bloom-spread scene is present, regardless of how smooth or scientifically plausible the transition looks.
level_4: Everything required for a 3 is met, and in addition: the sequence is structured as a clear multi-day time-lapse (via on-screen timestamps, day labels, or an explicit multi-frame progression) rather than a single real-time clip; and a bloom patch is present near an identifiable coastal feature (e.g., a river mouth or bay) in essentially every frame of the sequence, not only the first and last.
level_5: Everything required for a 4 is met, and in addition: the same overhead vantage point, zoom level, and shoreline outline is used in every frame of the sequence; and no extraneous elements (vessels, opaque cloud cover over the bloom area, unrelated text, or graphic overlays) obscure the shoreline or the bloom patch at any point.

Scientific and Causal Correctness rubric:
level_1: The patch's coloring is wrong for a phytoplankton bloom (e.g., solid purple, black, bright yellow, or stark white) rather than a green/teal water discoloration, or the patch reads as a solid opaque object or floating debris rather than a discoloration within the water, or the patch appears detached from the water surface entirely (e.g., resting on land or hovering above the sea).
level_2: The patch looks roughly green or blue but its hue jumps inconsistently between frames (e.g., swinging between cyan, lime, and magenta); its edges look hard-edged and cartoon-like rather than soft and diffuse; or the patch appears to shift position independently of the surrounding water (e.g., it slides across the frame while the water beneath it shows no matching current motion).
level_3: The patch's color stays within a believable green-to-teal, chlorophyll-like range across frames and remains confined to the water surface, never appearing on land or in the air, and it visibly grows over time, but at least one frame shows the patch extending past the shoreline onto land, breaking its containment within the water body.
level_4: Everything required for a 3 is met, and in addition: the patch's color always stays within a natural phytoplankton range (green, turquoise, olive, or brownish-green; never red, violet, neon, or grayscale); the patch only ever grows over water and never crosses the shoreline onto land; and its direction of growth looks like a plausible response to the visible water-current pattern rather than expanding in a way unrelated to the water's texture or flow.
level_5: Everything required for a 4 is met, and in addition: the patch's color grades naturally from a deeper green near its point of origin (e.g., the river mouth or bay where it first appeared) to a lighter shade at its growing edge; its margins look irregular and feathered rather than smooth or geometric, echoing the surrounding water's texture and flow lines; and no frame shows an artificially uniform, pixelated, or perfectly symmetric bloom shape.

Spatiotemporal Consistency rubric:
level_1: The satellite's vantage point suddenly jumps to a different zoom level or angle between frames; the bloom patch or the shoreline itself disappears and reappears without any transitional frame; the water's surface glare or overall image brightness swings dramatically from one frame to the next with no gradual change; or the water's surface texture abruptly switches (e.g., from a rippled, textured look to a flat, glassy one) with no frames showing the transition.
level_2: The overhead framing stays roughly top-down but the zoom level or crop drifts between frames; the shoreline's outline warps or shifts shape across frames even though the land itself shouldn't move; the bloom appears in a new location with no frames showing it traveling there from its prior position; or the water's surface pattern loses consistency (e.g., its ripple or glare pattern contradicts itself from one frame to the next without a plausible reason).
level_3: The vantage point stays fixed and overhead, the shoreline stays in the same geographic position and shape frame to frame, the water's surface texture (ripples, glare, color grading) stays consistent with only natural-looking day-to-day variation, and the bloom's extent progresses in the same overall direction across frames, but at least one frame shows an abrupt jump in part of the bloom's size or shape (e.g., a section suddenly doubling in area or vanishing) that the surrounding frames don't explain.
level_4: Everything required for a 3 is met, and in addition: the bloom's growth reads as fully continuous with no missing in-between extents; no part of the bloom ever appears to shrink or move opposite to the overall outward expansion; the water's surface glare and overall scene brightness carry over smoothly from frame to frame with no sudden dark-to-bright or bright-to-dark swings; and neither the water nor the bloom shows any sudden tearing, snapping, or warping in its outline.
level_5: Everything required for a 4 is met, and in addition: the frame-to-frame progression looks smooth with no stuttering, jitter, or repeated identical frames; the bloom's leading edge advances at a believable, gradually changing pace rather than a constant mechanical glide or sudden stop; and the water's ripple pattern and the bloom's expansion stay visually in sync with each other and at a consistent scale across every frame.