ability of data, and the level of understanding of the hydrochemical and hydrobiological processes involved. Unfortunately, plexities of these processes, which are great, make the difficulties associated with hydrological modeling seem small parison. 水质模型的复杂性各有不同。其本质取决于作为模型的应用、数据的可获得性以及对于所涉及的水化学和水生物学过程的理解程度。可惜, 这些过程巨大的复杂性使得与水文模拟相关联的复杂性看起来相对较小。 In general, water quality models should permit acceptance of inputs in terms of pollutant (constituent) concentration versus time at points of entry into the system, description of the mixing and reaction ics in the stream element or groundwater element of concern, and synthesis ofa time-distributed output indicating pollutant concentration at the outlet of the element (segment) being modeled. An analogy may be drawn to the stream flow routing, which
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