Method for Inverse Traceability of Non-Point Source Pollution in Watershed and Computer Device

A method for inverse traceability of non-point source pollution in a watershed, comprising:

• acquiring basic data of a studied watershed, wherein the basic data comprises a digital elevation map, a land-use type map, hydrologic data, water quality data, and a weight and prior data of an export coefficient of each landscape type in the studied watershed, the landscape type comprises a source landscape and a sink landscape, wherein the source landscape represents a landscape type that acts as a pollution source in the studied watershed, and the sink landscape represents a landscape type that acts as a sink for pollutants in the studied watershed;
• determining a location-weighted landscape contrast index (LWLI) of each landscape type in the studied watershed and a pollutant load of the studied watershed in a predetermined time cycle according to the basic data, wherein the LWLI is used to indicate an impact of each landscape pattern on a migration process of non-point source pollutants, and the pollutant load comprises a pollutant load exported from the non-point source pollution to an outlet section of the studied watershed;
• determining, according to the pollutant load and the LWLI, based on a pre-constructed pollution traceability model, an amount of the non-point source pollutants entering a river for each landscape type in the studied field, wherein the amount of the non-point source pollutants entering the river for each landscape type in the studied field represents an amount of pollutants exported by each landscape type and entering the river and is used to measure a contribution of each landscape type to non-point source pollution in the studied watershed;
• and
• determining whether the amount of the non-point source pollutants entering the river exceeds a predetermined threshold, and sending a single to an external device in response to a determination that the amount of the non-point source pollutants entering the river exceeds a predetermined threshold.