Abstract

Spatial interpolation technique have been used effectively in research on Neighbor Natural resources and the environment based on in situ data. This article presents the results of estimating the concentration of some surface water quality parameters in the Red River and Duong River, including COD, BOD₅ and NH₄⁺ using the interpolation method. 56 waters quality samples were used to estimated the water quality parameters concentration, in which 43 samples were used to train the interpolation model and 13 samples were used to evaluate accuracy. Four common interpolation techniques, including Kriging, Inverse Distance Weighted (IDW), Neighbor Natural and Spline methods were tested to select the method with the highest accuracy. The results showed that the IDW interpolation method achieved the highest accuracy, shown by comparing the root mean square error (RMSE) for all three parameters COD, BOD₅ and NH₄⁺. From the obtaind results, in the study, the spatial distribution maps of COD, BOD₅ and NH₄⁺ parameters in the study area was built. The results received in the study can be used to monitor and evaluate surface water quality in the Red River and Duong River - the section flowing through Hanoi city