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... been measured by Qin Zheng and her team during their earlier survey of the river.
In modern times, water levels are often analyzed using absolute and reference base levels.
The absolute base level is usually the average sea level at a recognized seaport. However, in this era, there was no concept of an absolute base level.
Qin Zheng couldn’t find a seaport to measure the water level to establish an absolute base level in a short time, so they only measured the reference b ...
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