农业非点源污染主要由降雨径流、土壤侵蚀、地表溶质溶出和土壤溶质渗漏4个过程形成。
Agricultural non-point pollution is formed by 4 processes of rainfall runoff, soil erosion, surface solution stripping and soil solution seepage.
本文根据地表径流中溶质流失的流动特征和物理规律，基于矢量合成概念，建立了二层解析模型，描述从降雨开始径流使水溶质在地表的流失过程。
A simple two-layer analytical model was developed to describe the process of dissolved chemical loss in surface runoff from the beginning of runoff occurrence.
地表初始溶质浓度是影响溶质流失量的关键，也是模拟径流溶质流失的重要参数。
Surface effects of the initial solute concentration were the key to solute loss, also an important parameter of the simulated runoff solute loss.
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