Application of the CWQII method and a 2D water quality model to assess diversion schemes for East Lake (Donghu), Wuhan, China

Abstract

Ban X, Yu C, Pan B, Ren X, Du Y, Zhang L 2014. Application of the CWQII method and a 2D water quality model to assess diversion schemes for East Lake (Donghu), Wuhan, China. Lake Reserv Manage. 30:358-370. The water quality of East Lake, the largest urban lake in China, has continuously deteriorated as a result of urban development. To improve the lake's water quality, a diversion construction project is underway to divert water from the Yangtze River to the lake to accelerate the flow cycle and decrease nutrient concentrations. This study assessed the effects of proposed diversion schemes on water quality using the composite water quality identification index (CWQII) method and a 2-dimensional (2D) water quality model. The study results indicated that the water quality of the lake is strongly influenced by diversion schemes, including diverting locations, discharge, and time. The optimum diversion inlet was inlet 2 (located in Shuiguo Bay), and the most efficient discharge was 30 m 3 /s. Diverting from different inlet locations caused more obvious reduction rates of CWQII in summer (Jul) than in winter (Jan). After diversion, CWQII values throughout the entire lake were reduced, and the spatial distribution of CWQII became more homogeneous. The highest reduction of CWQII occurred near the inlet location. The CWQII method and 2D water quality model provided a relevant example for assessing the general water quality and designing optimal schemes for diversion projects to improve water quality in large shallow lakes.

Are the Water Quality Improvement Measures of China’s South-to-North Water Diversion Project Effective? A Case Study of Xuzhou Section in the East Route

“…The comprehensive water quality identification index (CWQII) developed by Xu [ 26 ] is widely used in the water quality assessment in China [ 12 , 14 ]. This method has several advantages: it can perform both qualitative and quantitative evaluation of water quality; it can be used not only to evaluate the water quality of different sections in the same river, but also to compare the water quality in different rivers; it can avoid the influence of an individual water quality indicator, so that the integrated condition of the water quality can be reflected reasonably; and it can not only divide the water quality into different categories, but also compare the water quality of the same category [ 12 ].…”

“…Yang et al [ 12 ] used several different methods to assess the water quality of Chaohu Lake basin in China and found that the comprehensive water quality identification index (CWQII) could better assess the water quality compared with the other methods by providing qualitative and quantitative analysis. Because of this advantage, the CWQII method had wide application in the water quality assessment of the lakes and rivers in China, such as Honghu Lake [ 13 ], Donghu Lake [ 14 ], and Hanjiang River [ 15 ].…”

Different methods for the evaluation of surface water quality: The Case of the Liao River, Liaoning Province, China

“…Liu et al (2011) used a pollution index method to evaluate the water quality in the coastal waters of Bohai and both Chemical Oxygen Demand (COD) and phosphate were main pollution factors. However, this method cannot judge water quality class according to Chinese national standards (Yin & Xu, 2008;Ban et al, 2014).…”

Integrated monitoring of lakes’ turbidity in Wuhan, China during the COVID-19 epidemic using multi-sensor satellite observations

“…According to previous studies, the main sources of suspended particle matters in Wuhan lakes include river flowing input, land surface runoff input, and human activities (industry, agriculture, and aquaculture). Water diversion facilities and lake-river connection projects, which has been implemented since 2000s in Wuhan, could increase water exchange between lakes and rivers, thereby bring about sediments transport (Ban et al 2014). Particle matters and soil particles from the lake banks could also be brought into lakes through land surface runoff during rain and snow (Peng et al 2012).…”