含沙量Sediment
黄河多年平均含沙量约 7.3 kg/m³，调水调沙期可骤升。泥沙越多，黄水越"重"，与海水对比越强。Long-term mean ~7.3 kg/m³, spiking during water–sand regulation. More sediment → sharper contrast with seawater.
黄河入海口 · 第四章Yellow River Estuary · Chapter Four
当含沙的黄河水，撞进渤海的蓝。 Where sediment-laden Yellow River water collides with the blue sea.
一部关于"黄蓝分界线"的纪录短片与田野研究：为什么这条界线存在、何时出现、又何时消失。这是一个高二学生的长期项目 Silt and Stories（泥沙与故事）的影像篇章。 A documentary short and field study of the yellow–blue demarcation line — why it exists, when it appears, and when it vanishes. The film chapter of Silt and Stories, a long-term project by a high-school student.
同一机位、跨季节的时序对比，是这套记录的核心。以下为占位，真实素材将于实地窗口后逐步填充。Same-rig, cross-season comparisons are the core of this record. Placeholders below; real footage fills in after field windows.
黄蓝分界线不是风景，而是整个河口生态系统的可视化指标：泥沙浓度、流量与潮汐三者共同决定它何时清晰、何时消散。 The line is not scenery — it is a visible indicator of the estuary's ecosystem: sediment load, flow and tide together decide when it is sharp and when it dissolves.
黄河多年平均含沙量约 7.3 kg/m³，调水调沙期可骤升。泥沙越多，黄水越"重"，与海水对比越强。Long-term mean ~7.3 kg/m³, spiking during water–sand regulation. More sediment → sharper contrast with seawater.
约 1000 m³/s 时景观较佳：太大不安全，太小分界不明显。~1000 m³/s is ideal — too high is unsafe, too low makes the line faint.
涨潮时段最佳：海水顶托河水，阻止泥沙快速扩散，界线最清晰。Flood tide is best: seawater holds back the river, slowing sediment spread — the sharpest line.
文中数值为公开资料检索所得，引用前将在"参考"页核实并标注来源。Figures are from public sources; they will be verified and cited on the References page before publication.
红滩起色期色彩基线 + 本年度全部航拍（10.10 起禁飞）。黄蓝线首次尝试以踩点为主。Red-beach color baseline + all annual aerials (no-fly from Oct 10). First yellow–blue attempt is mostly scouting.
观鸟基地冬季开放，地面摄影；无人机禁飞中。Winter birding base open; ground photography; drones grounded.
全年含沙量峰值，黄蓝分界线最清晰——本片成败所在。Peak sediment of the year, clearest line — the film's make-or-break window.