The Soft-Sensing for Flow Pattern Fuzzy Boundary Discharge at the Lateral Gate of Irrigation Channel

Water discharge at the lateral gate of irrigation channel is estimated by measurable information such as lift-level of floodgate, water-level at front and back of the floodgate and so on, that has typical characteristics of soft-sensing. However, along with approaching the boundaries of two or more than two flow patterns, the estimation errors of discharge become larger. In accordance with fuzzy characteristic of flow pattern boundaries at the lateral gate of irrigation channel, a soft-sensing method combining overall discharge coefficient fuzzy inference and information fusion of multi-momels based on distance measure is proposed. The effectiveness of this programme is verified partially by hydraulic expermental data acquired from fuzzy boundary of the stream shape.