T/CSES 06-2019 Lake algal control process water quality target management technical guidelines and sub-lake algal control performance evaluation ray and rail line decomposition method

Scope

Main technical content: 1. **Zero-point ray method**: - The extrapolation reference point of the trajectory TLe at the endpoint coincides with the background conditions of the endpoint. - Within a certain range of the endpoint, the phosphorus algae production efficiency does not vary significantly. - Assuming that the phosphorus algae production efficiency at the endpoint is the same as that at the reference point, the CHLa value of the reference point is determined by the zero-point ray passing through the CHLa-TP plot (with a slope equal to the algae production efficiency of TP) and the vertical line passing through the starting point TP. - For the original path, when the trajectories become enriched or impoverished and TP increases, the estimated value of the reference point CHLa is generally lower; when TP decreases, the estimated value of CHLa is generally higher. - For the left-turn path, when the trajectories become impoverished and TP increases, the estimated value of CHLa is generally lower; when TP decreases, the estimated value of CHLa is generally higher. - For the right-turn path, when the trajectories become impoverished and TP increases, the estimated value of CHLa is generally lower; when TP decreases, the estimated value of CHLa is generally higher. The zero-point ray method is more suitable for non-coordinated segments (periods when chlorophyll-a is negatively correlated with the concentration of the main controlling nutrients), and it can also be used for coordinated segments. 2. **Monotonic trajectory extension method**: - Between the inflection points of the filtered trajectory, the curve is generally monotonic. If the trajectory is coordinated, it is reasonable to extrapolate based on the assumption of stable background conditions. Therefore, a regression line passing through the points on the trajectory is used to determine the reference point for the fixed-endpoint potential trajectory, thereby dete

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