水库沉积物氮磷释放通量及释放规律研究

Study on flux and release law of nitrogen and phosphorus of sediment in reservoir

在现场调查的基础上,采集了产芝水库深度为20cm的底泥。通过室内柱状试验,研究了不同温度和不同水动力扰动条件下沉积物的氮磷释放通量和释放规律。结果发现,在温度和水动力联合作用下,氮磷释放通量具有一定的规律性。在试验初期,氮磷快速释放达最大值,之后释放缓慢趋于平衡;在同一温度下,随着扰动强度的增大,释放通量增大;且静态与动态释放之间,存在明显分化,温度越低分化越明显;释放后期,温度的影响处于强势地位。在以上试验的基础上,建立了氮磷释放通量与释放时间之间的关系式,研究结果可为产芝水库富营养化治理提供科学依据。

Based on the field investigation and drilling,sediments of 20cm depth in the Chanzhi reservoir were collected.By cylindrical test indoor,flux and release law of nitrogen and phosphorus in water-sediment interface were studied in different temperature and different hydrodynamic disturbance conditions.The results show that due to the combining effect of temperature and hydrodynamic,flux of nitrogen and phosphorus has some regularities.In the beginning of test,nitrogen and phosphorus released rapidly and reached the peak values,then releasing slowly and tending to the balance.At the same temperature,as the disturbance intensity increased,the flux increased.Between the static and dynamic release,there were obvious differentiations.The lower the temperature is the more obvious differentiations will be.In the later period of test,the effects of temperature were in a strong position.Based on the above test,the equations expressing the relation among nitrogen and phosphorus flux and release time were built.