Effects of hyporheic processes on streambed vertical hydraulic conductivity in three rivers of Nebraska

Autor:	Jinxi Song, Scott Summerside, Cheng Cheng, Fujiang Wen, Xunhong Chen
Rok vydání:	2007
Předmět:	Hydrology geography geography.geographical_feature_category Sediment Aquifer STREAMS Permeability (earth sciences) Geophysics Hydraulic conductivity Downwelling General Earth and Planetary Sciences Upwelling Hyporheic zone Geology
Zdroj:	Geophysical Research Letters. 34
ISSN:	0094-8276
Popis:	[1] Streambed hydraulic conductivity is of great importance in the analysis of stream-aquifer interactions and stream ecosystems. We investigated streambed vertical hydraulic conductivity (Kv) with two connected depths in three rivers of Nebraska. Our results demonstrated that streambed Kv in the upper sediment layer was much higher than that in the sediment of the lower layer. We speculate that hyporheic processes can result in larger streambed Kv in the upper layer. Specifically, water exchange through upwelling and downwelling zones can lead to bigger pore spaces and a more unconsolidated structure of sediments in the upper layer. The upward movement of gas produced by redox processes can loosen the sediments and further enlarge pore spaces in the upper layers. Also, permeability can increase as a result of expanded pore spaces caused by invertebrate activities in the upper part of streambed. The higher Kv will likely enhance exchange processes between stream and sediments.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::27d8b158a1b9a58d7b010363842005b7 https://doi.org/10.1029/2007gl029254 Zobrazit plný text záznamu Plný text