名詞 hydrography:

1. the science of the measurement and description and mapping of the surface waters of the earth with special reference to navigation

hy.drog.ra.phy

n.（名詞）
【復(fù)數(shù)】 hy.drog.ra.phies
The scientific description and analysis of the physical conditions, boundaries, flow, and related characteristics of the earth`s surface waters.
水文地理學(xué)：對(duì)地球表面上的水的物理狀態(tài)、邊界、流動(dòng)及相關(guān)特征進(jìn)行的科學(xué)描繪、分析的一種科學(xué)
The mapping of bodies of water.
給水體做地圖

【引伸】
hydrog.rapher
n.（名詞）
hy.drograph.ic
hy.drograph.ically
adv.（副詞）