Correlation and spatio-temporal variation characteristics of water quality in the main stream of Sancha River
Sancha River is the source of Wujiang River.In order to fully understand the water quality of Sancha River basin,and better protect the source water,the spatio-temporal variation characteristics of water quality in the main stream of Sancha River in 2022 and the correlation between monitoring in-dicators were studied.The analysis indicators included 8 items in total:DO,pH,NH3-N,TN,CODCr,BOD5,CODMn and TP.The results showed that 1)The water quality remained in class Ⅲ or above all the year round(TN did not participate in the evaluation),and the water quality was excellent.The wa-ter body showed weak alkalinity and high DO content throughout the year.The external pollution was mainly from agricultural non-point sources along the river and the surrounding residential sewage dis-charge.2)The spatial variation coefficients of CODCr,CODMn and BOD5 were between0.3～0.5,with a significant positive correlation among the three indicators.The spatial variation characteristics were mid-stream>downstream>upstream.The spatial variation coefficients of NH3-N and TP are both more than 0.9,and there was a significant spatial distribution difference between them.There was a very signifi-cant positive correlation between them,and the variation characteristics were midstream>upstream>downstream.There was no significant correlation between TN and other indexes,and TN showed the spatial variation characteristics of downstream>midstream>upstream.3)In 2022,TN of Sanchahe Riv-er show the temporal variation characteristics of July>October>January>April,and the concentration of TN is mainly affected by human activities.Other indexes had no obvious time change characteristics.
Sancha Riverspatial variation of water qualitytemporal variation of water qualitycorre-lation
NETL
NSTL
万方数据
