Impacted both by human activities and the global climate change, the water quality safety of the drinking water sources of lakes and reservoirs faces huge risks and challenges. The high concentrated chromophoric dissolved organic matter (CDOM) coming both from the production of the lake itself and from the external sources can cause the drinking water to become sour and stinky, increase the high concentrated carcinogenic substances produced during the processing of drinking water, which severely threatens the safety of drinking water for human and beasts. For drinking water sources like the land surface lakes and reservoirs, the input of organic matter from the outside catchment normally dominate the CDOM reservoir. While the rainfall runoff process, especially the extreme weather like rain storm, will directly affect the components and structures and fluxes of the organic matter going into the river. Alternant dry seasons and wet seasons can also cause the runoff to change from flowing through the low organic layer in dry seasons to flowing to high organic layer. Although domestic and foreign scholars have carried out a large number of studies on the CDOM sources of drinking water sources, there are still few cases on the responses of origins, components and structures of chromophoric dissolved organic matter to catchment water. Jointly funded by programs including the National Science Fund for Distinguished Young Scholars, doctoral student Zhou Yongqiang of Zhang Yunlin reaserch group of Nanjing Institute of Geography and Limnology and other members, basing on the CDOM field observing data of different hydrology process from 2013 to 2015 and by considering the data of catchment rainfall, flux and water level and through the method of three-dimensional fluorescence pattern and parallel factor analysis, quantitatively studied response methods and degrees of the origins, components and structures of CDOM of Qiandao Lake to the main river of the flux of catchment, Xinan River

The result shows that in the wet season, the absorption coefficient representing the abundance of CDOM and the fluorescence of terrigenous humus acid resulted from parallel factor analysis are obviously higher than that in the dry season. However, the characteristics wavelength absorption coefficient ratio, spectral slope and spectral slope ratio representing the relative molecular mass of CDOM are obviously lower in the wet season. The research result further shows that the CDOM absorption coefficient, terrigenous humus acid fluorescence components and Xinan River flux are positively correlated, while the semi-quantitative parameter of the origin and component representing CDOM and Xinan River flux are negatively correlated. It indicates that among the CDOM flowing into the river in the wet season, aromatic humus-like acid is in the domination position. Therefore, it is needed to increase the removal rate of CDOM in the drinking water in extreme rain storm weathers. Besides, the adopt of real time and high-frequent CDOM optical probe can provide fast inspection and effective alert to the possible pollution of water sources and water quality in rain storms and scientifically support the on-line supervision and protection of our country's water sources and water quality.