《Table 5 Water quality of the Tangxun Lake group before and after IRSN under different schemes》

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《一种河湖水系连通方案的综合评估方法——以汤逊湖湖泊群为例（英文）》

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Note:TXL，SL，HJL，QLL and YL represent the Tangxun Lake，the South Lake，the Huangjia Lake，the Qingling Lake and the Yehu Lake，respectively.

Furthermore，the water quality improvement rate，the concentration change index and the water quality category ratio of the lakes 20 days later after water diversion were analyzed，as shown in Table 5.It can be seen that the water quality in the South Lake improved obviously after the water was diverted from the Donghu Lake under Scheme I，and the water quality improvement rates of NH3-N，TN and TP were 31.21%，38.85%and 55.97%，respectively.The water standard exceeding ratio reduced from 98.03%before water diversion to 32.89%.Relatively，Scheme I had less effects on the water quality of the Tangxun Lake.For Scheme II，the water quality of the Tangxun Lake improved significantly.However，for the reason that Scheme II only diverted water from the Liangzi Lake and water can hardly flow to the South Lake located in the upstream of the Tangxun Lake，Scheme II almost had no effect on the water quality of the South Lake.Scheme III diverted water from both the Donghu Lake and the Liangzi Lake，and the water quality of both the South Lake and the Tangxun Lake improved significantly.The proportion of grades I–III increased obviously，and the proportion of Grade V and worse than Grade V decreased to some extent.Schemes IV and V were designed to connect the Tangxun Lake and the South Lake with the downstream lakes through the newly-built channels.As a result，the water quality of the Huangjia Lake and the Yehu Lake also improved after water diversion.Generally，the water quality of the Huangjia Lake was slightly worse than that of the Qingling Lake.For this reason，the water quality of the Qingling Lake deteriorated after water diversion.