Effective diffusivity and mass flux across the sediment-water interface in streams
نویسندگان
چکیده
منابع مشابه
Effective diffusivity and mass flux across the sediment-water interface in streams
[1] The exchange of water between a stream and its hyporheic zone (defined as the sediment beneath and immediately adjacent to a stream) underpins many ecological and hydrological functions in turbulent streams. Hyporheic exchange can be parameterized in terms of an effective diffusion coefficient Deff and considerable effort has gone into developing process-based models and empirical correlati...
متن کاملBiological Mediation of Material Fluxes across the Sediment-water Interface in Estuaries and Coastal Systems
The strong association of contaminants with fine-grained or organic-rich sediments is well established. Contaminants focused at the sediment-water interface may be resuspended, transported, transformed or buried, depending on the phasing and interactions among biological, physical and chemical processes. Our long term goal is to develop a better understanding of how materials are exchanged acro...
متن کاملCritical velocity in phosphorus exchange processes across the sediment-water interface.
Sediments are ultimate sinks of nutrients in lakes that record the pollution history evolutionary processes, and anthropogenic activities of a lake. However, sediments are considered as inner sources of environmental factor changes such as the variation in hydrodynamic conditions because of the nutrients they release. How does this process happen? This study investigates a typical nutrient phos...
متن کاملInteraction Between Hydrodynamics and Mass- Transfer at the Sediment-Water Interface
Modeling mass-transfer across the sediment-water interface is a significant issue in environmental hydraulics. In fact diffusional exchanges of solutes between the bed sediment and the overlying water column could greatly affect water quality. Particularly, diffusional flux of dissolved oxygen (DO) towards the bed sediments from the water column could be responsible for low and unacceptable lev...
متن کاملMeasuring nutrient fluxes across the sediment-water interface using benthic chambers
This paper presents a simple model to determine the benthic fluxes of matter across the sediment-water Interface when a benth~c hamber is used. The model is based on accepting that the limiting step for the overall rate of transfer while the chamber is in position is the diffusion through the diffusive boundary layer (DBL) overlying the sediment, and it assumes that this rate is necessarily aff...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Water Resources Research
سال: 2012
ISSN: 0043-1397
DOI: 10.1029/2011wr011148