Abstract
Based on the historical data of river water quality in the central city of Pinghu from 2014 to 2018, the temporal and spatial distribution of river water quality changes and its influencing factors were analyzed, and the correlation between the main monitoring factors was identified by linear regression. The results show that water quality of the main rivers has improved significantly, and the concentrations of COD, NH3-N and TP in most rivers can reach the class III standard of surface water. In recent years, the water quality of the rivers shows a significant improvement trend, and the improvement effect of NH3-N concentration is the most obvious. The water quality of general rivers tends to improve, but the effect of treatment is relatively insufficient. Spatially, the water quality in the northern part of the flood control area is worse than that in other areas, and the main river is better than the general river. The fitting effect of COD, NH3-N and TP is good, and there is a significant correlation between the main river.
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