期刊论文

Estimation of Nitrogen Diffusion Flux of Interface between Sediment and Its Overlying Water in Ditches in Nanhan Embankment before and after Dredging in 2017

中文

湿地科学

1672-5948

2020

18

04

468-474

10.13248/j.cnki.wetlandsci.2020.04.011

国家自然科学基金项目（51308068）； 湖南省重点研发计划项目（2017SK2361和2018XK2009）资助；

本校为其他机构

为了了解清淤对水渠中沉积物与其上覆水界面氮扩散通量的作用,在洞庭湖区南汉垸的玉成电排渠、汉新排渠、永兴排渠和下新码头排渠中,分别设置采样点,于2017年11月15日(清淤前)和12月20日(清淤后),采集沉积物及其上覆水样品,测定水样的各项指标,并测定沉积物的含水量和孔隙率,计算沉积物间隙水与其上覆水中的氨氮和硝态氮浓度梯度;采用Fick定律,估算沉积物与上覆水界面的氮扩散通量,比较了清淤前后沉积物与上覆水界面氮扩散通量。研究结果表明,清淤后,玉成电排渠、汉新排渠、永兴排渠和下新码头排渠水体中的总氮质量浓度分别减小了2.05 mg/L、0.70 mg/L、0.72 mg/L和2.90 mg/L,氨氮质量浓度分别减...

In order to comprehend the role of dredging on nitrogen diffusion flux of interface between sediment and its overlying water, Yuchengdian drainage channel, Hanxin drainage channel, Yongxing drainage channel and Xiaxin wharf drainage channel in Nanhan Embankment in the Dongting Lake area were selected and the sampling sites were set in the four channels.The sediments and overlying water were sampled on November 15 and December 20, 2017(before and after dredging).The indexes of water samples, moisture content and porosity of sediment were determi...