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为产生一种流经植被过滤带的薄层水流研制了一种往流模拟器（ＦＳＡ）。该装置取料容易，功能全，携带方便，性能稳定，变异系数小于１．５％，地表径流的试验流量为≥４Ｌ／ｍｉｎ，初始田间试验中，应用该装置向１ｍ × ５ ｍ的水牛草小区施用 ０．１ｍｇ／ｋｇ的莠去津溶液。草地的径流量相当于在 ５１ｍｍ降雨量情况下直接从 ３０ ｍ宽的坡上产生的径流量。在最初的 １５ ｍｉｎ内，流出的莠去津溶液的浓度降低，然后上升，最后稳定在输入浓度的 ８５％。稍加修正，ＦＳＡ可以为集中径流实验提供输入水流。
A flow-to-flow simulator (FSA) was developed to generate a thin layer of water flowing through the vegetation filter belt. The device has the advantages of easy picking, full function, convenient carrying, stable performance, a coefficient of variation of less than 1.5% and a test flow of surface runoff of ≥ 4L / min. In the initial field experiment, the device was applied to 1m × 5m buffalo grass The plot was administered a 0.1 mg / kg of atrazine solution. The runoff from the meadow corresponds to the runoff directly from the 30 m wide slope at a rainfall of 51 mm. During the first 15 min, the effluent concentration of the atrazine solution decreased and then increased, finally stabilizing at 85% of the input concentration. With minor corrections, the FSA can provide input flow for centralized runoff experiments.