2 results about "Nonpoint source pollution" patented technology

This application belongs to the field of ecological and environmental protection technology, specifically relating to a method for delineating the width of river ecological buffer zones, aiming to address the shortcomings of traditional equal-width delineation methods in terms of pollution interception accuracy and land use efficiency. The method includes: extracting topographic and hydrological features based on a DEM and identifying key runoff paths to determine high-load inlets; constructing a spatial heterogeneity weighting factor by combining the average runoff accumulation, slope, and surface roughness of the upstream confluence area; dynamically calculating the buffer zone width at each inlet using a base width as a benchmark; generating boundaries by non-equidistant offset along the riverbank normal, and forming continuous closed polygons through smoothing and topological verification. This application, through hydrologically driven dynamic width adjustment, significantly improves the interception capacity for non-point source pollutants, avoids land resource waste, and achieves scientific, efficient, and automated ecological buffer zone delineation.

The invention relates to a plain river network polder area non-point source pollution water inlet load accounting method. The method comprises the steps that the runoff yield of a pollution production unit is calculated in a water volume module; calculating the non-point source pollution discharge amount of each pollution production unit in the water quality module; calculating a non-point source pollution in-water body coefficient of each pollution production unit in a water body migration module; and accounting to obtain the total load of the non-point source pollutants entering the water body of the pollution production unit. According to the method, polder area non-point source pollution characteristics, the distance between a pollution production unit and a receiving water body and the interception effect of forests and grassland on pollutants are fully considered, and meanwhile the runoff yields of different underlying surfaces under the rainfall condition are combined; therefore, the influence of different hydrological driving conditions and the land migration interception process on the non-point source pollutant entering the water body can be more accurately represented, the key time period and key area risk of the non-point source pollutant entering the water body can be identified, and the method has good applicability in actual implementation.