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Trans-jurisdictional conflict in both water quantity and quality is a general concern in large river basins. In this paper, the relative utility function combined with the asymmetric Nash bargaining method was established to analyze the trans-jurisdictional conflict between water quantity and water quality in the Zhangweinan Canal Basin in China. The basin was divided into four conflict stakeholders, namely, Shanxi, Hebei, Henan, and Shandong Provinces, based on administrative unit. The water usage and pollutant discharge scheme for multiple stakeholders was optimized using the established model to satisfy the environmental flow and water quality objectives at the identified conflict sections. The results indicated that the total water consumption was reduced from 4.38 × 10 m in 2007 to 1.97 × 10 m, and that the allowable COD and NH-N discharged into the river was less than 3.8 × 10 t and 4.3 × 10 t, respectively. About 81.1 % of COD and 76.1 % of NH-N should be further reduced compared with the values in 2007. [ABSTRACT FROM AUTHOR]

Thirty surface sediments, corresponding overlying water and porewater samples were collected for analysis of organochlorine pesticides (OCPs) from Taihu Lake, China in May 2010. Altogether six OCPs, i.e. hexachlorobenzene (HCB), β-hexachlorohexane (β-HCH), p,p′-DDE, p,p′-DDD, p,p′-DDT, and o,p′-DDT were detected, and the total OCPs varied from 7.84 to 32.23 ng g in sediments, from 136.97 to 2,185.14 ng L in porewater and from 24.27 to 154.07 ng L in overlying water, respectively. The highest levels of contamination in sediment was observed in southeast of the lake, while in water and porewater samples highest levels were found in Zhushan Bay, the seriously polluted area in the north part of Taihu Lake. The partition coefficient of measured OCPs between sediment-overlying water was five and six fold higher than that between sediment-porewater, indicating the different distribution patterns of OCPs among sediment, overlying water and porewater matrices. The ratios of DDT/(DDD + DDE) ranged from 0.57 to 2.28 in sediments, 0.93-13.02 in porewater and 0.84-15.98 in overlying water, respectively, suggesting the potential new source of DDTs into the lake. The ratios of o,p′-DDT/ p,p′-DDT in the three matrices were centered around 0.2-0.3, indicating the o,p′-DDT in the lake was originated from historical usage of technical DDTs. [ABSTRACT FROM AUTHOR]

A simple method is presented to assess the accumulation of chemical oxygen demand (COD) and ammonia-nitrogen (NH3−N) loads as applied to the Zhangweinan Canal basin, one of the most highly stressed watercourses in the heavily developed Hai River basin in China. The river was divided into seven monitoring sections. The pollution sources and processes in each section, including pollutant inputs and outputs plus their annual fluxes and attenuations, were determined to calculate their accumulation loads. The spatial variations of COD and NH3−N accumulations in the different sections indicated that the accumulation loads were closely related to pollutant inflows and environmental fluxes. [ABSTRACT FROM PUBLISHER]