Study on supplement of water quality monitoring data and analysis of pollution source by distributed hydrological model
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Abstract:
Water quality mo nitoring play s a significant ro le in w ater envir onment impact assessment and water environment man2 ag ement . The current water quality monito ring data hav e the fo llow ing problems: low monit oring frequency , difficult ies in mo ni2 to ring , complex it y of influencing facto rs, and low level o f informatization. T o make up fo r the abo ve disadv antag es, w e used the distribut ed hydro lo gical model to supplement t he w ater quality mo nitoring data and trace the sour ce of pollutants. A case study was conducted in the Jianjiang Riv er basin. We established a SWAT mo del to simulate the tot al pho sphor us po llut ants based o n the hy dr ometeor olog y, the underly ing surface data, and the wat er qua lity data of fo ur sectio ns from 2010 t o 2014. Results indica2 ted that the dist ributed hydro log ical mo del can not only complement the to tal pho sphor us dat a o f the four monito ring sections in the same perio d, but also t race the so ur ce of total phospho rus pollutio n in t his basin to non2po int source po llut ion, and r ev eal the spatial distributio n o f the non2point so ur ce pollution and the pro po rtions of different pollutio n categ ories. Fert ilizer loss is the main po llution source in this basin, particularly in wet y ea rs, in w hich it acco unted for up to 66% o f po llut ion
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