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在不受人类活动影响和干扰的条件下,地表水资源估算的主要内容,应该是分析和研究地表径流及与它密切相联的水平衡要素之数量和时空分布。参照第二讲中的图1,将流域分为地表、包气带和潜水带三层,对闭合流域可写出年多平均的水量平衡方程式如下: P=R_s十R_g+ET_s+ET_g (3—1)式中 P——大气降水;R——地表径流量;R——地下径流量;ET——地面和包气带的蒸,
Without affecting and disturbing human activities, the main content of surface water resources estimation should be to analyze and study the quantity and distribution of surface runoff and its closely related water balance elements. According to Figure 1 in the second lecture, the basin is divided into three layers: surface, aeration zone and submersible zone. The equilibrium equation of annual mean water volume can be written as follows: P = R_s + R_g + ET_s + ET_g -1) Where P - atmospheric precipitation; R - surface runoff; R - underground runoff; ET - steamed ground and aeration zone,