noun
hydrology
Scientific study of water on Earth, including its distribution, movement, and quality. Used in academic and technical contexts.
水文学は、地球上の水の循環を研究する学問です。
Hydrology is the study of the water cycle on Earth.
水理学 (hydraulics) focuses on the mechanical behavior of water, especially in engineered systems, while 水文学 (hydrology) covers the broader natural water cycle.
Compound of 水 (water) + 文 (pattern, writing) + 学 (study). The term is a direct translation of the Western concept of hydrology, likely coined in the modern era.