世界三大瀑布指巴西、阿根廷交界的伊瓜苏瀑布（世界上最宽）、东非赞比亚和津巴布韦交界的维多利亚瀑布以及美国加拿大交界的尼亚加拉瀑布。这三个瀑布无论从宽度、面积、流量都远超其他瀑布，并且都是跨国瀑布。世界排名第四的跨国瀑布是中国与越南交界的德天瀑布。1.^ a b c d e f Waterfalls Website 存取自二零零七年三月一日<br>2.^ a b c d e Commission on Dams website: "Case Study — Kariba Dam-Zambezi River Basin" Annex 13 & 14 Victoria Falls Mean Monthly Flows. 网站存取自二零零七年三月一日。此网站提供了每立方米/秒为单位的月平均流量(i.e., the total volume of water passing in each calendar month divided by the number of seconds in the month), 指水文学里冲量的标准，用作指示流量的季节变化。 A figure of around 9,000 m³/s (318,000 cu ft) is quoted by many websites for Victoria Falls but this is the mean maximum instantaneous rate, which is only achieved for a little amount of days per year. The figure of 536 million m³/minute (18.9 billion cu ft/min) on some websites (eg ZNTB) is an error for 536 million litres/minute (equivalent to 9100 m³/s or 142 million U.S. gallons/min). "十年最高" 是指十年内各个月份最高流量值的平均数。
水文学里冲量的标准指示什么？ 的答案在上面的段落中。它是什么？
流量的季节变化。