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Extension of the River Water Quality Model no. 1 with the fate of pesticides

机译：河流水质模型的扩展。 1与农药的命运

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The existing River Water Quality Model No. 1 (RWQM1) was extended with processes determining the fate of non-volatile pesticides in the water phase and sediments. The exchange of pesticides between the water column and the sediment is described by three transport processes: diffusion, sedimentation and resuspension. Burial of sediments is also included. The modified model was used to simulate the concentrations of diuron and chloridazon in the river Nil. A good agreement was found between the simulated pesticide concentrations and measured values resulting from a four-month intensive monitoring campaign. The simulation results indicate that pesticide concentrations in the bulk water are not sensitive to the selected biochemical model parameters. it seems that these concentrations are mainly determined by the imposed upstream concentrations, run-off and direct losses. The high concentrations in the bulk water were not observed in the sediment pore water due to a limited exchange between the water column and the sediment. According to a sensitivity analysis, the observed pesticide concentrations are highly sensitive to the diffusion and sorption coefficients. Therefore, model users should determine these parameters with accuracy in order to reduce the degree of uncertainty in their results.
机译：现有的第1号河流水质模型（RWQM1）进行了扩展，确定了水相和沉积物中非挥发性农药的命运。水柱和沉积物之间的农药交换通过三种传输过程来描述：扩散，沉降和再悬浮。也包括埋葬沉积物。修改后的模型用于模拟尼尔河中敌草隆和氯哒嗪的浓度。在为期四个月的密集监测活动中，模拟农药浓度与测量值之间找到了很好的一致性。模拟结果表明，散装水中的农药浓度对所选生化模型参数不敏感。看来，这些浓度主要是由施加的上游浓度，径流和直接损失决定的。由于水柱和沉积物之间的交换受限，在沉积物孔隙水中未观察到高浓度的散装水中。根据敏感性分析，所观察到的农药浓度对扩散系数和吸附系数高度敏感。因此，模型用户应准确确定这些参数，以减少结果不确定性的程度。

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