| DOI: | 10.1002/2015GL066156
|
| 论文题名: | Surface water-groundwater connectivity in deltaic distributary channel networks |
| 作者: | Sawyer A.H.; Edmonds D.A.; Knights D.
|
| 刊名: | Geophysical Research Letters
|
| ISSN: | 0094-8370
|
| EISSN: | 1944-8101
|
| 出版年: | 2015
|
| 卷: | 42, 期:23 | | 起始页码: | 10299
|
| 结束页码: | 10306
|
| 语种: | 英语
|
| 英文关键词: | delta
; floodplain
; hydrologic connectivity
; network
; surface water-groundwater interactions
; water quality
|
| Scopus关键词: | Finance
; Groundwater
; Groundwater flow
; Networks (circuits)
; River diversion
; Rivers
; Sea level
; Sediment transport
; Water quality
; Water resources
; delta
; Flood plains
; Groundwater residence
; Hydrologic connectivity
; Relative sea level rise
; Sediment transport model
; Steady groundwater flows
; Surface water-groundwater interaction
; Surface waters
|
| 英文摘要: | Delta distributary channel networks increase river water contact with sediments and provide the final opportunity to process nutrients and other solutes before river water discharges to the ocean. In order to understand surface water-groundwater interactions at the scale of the distributary channel network, we created three numerical deltas that ranged in composition from silt to sand using Delft3D, a morphodynamic flow and sediment transport model. We then linked models of mean annual river discharge to steady groundwater flow in MODFLOW. Under mean annual discharge, exchange rates through the numerical deltas are enhanced relative to a single-threaded river. We calculate that exchange rates across a <10 km2 network are equivalent to exchange through ∼10-100 km of single-threaded river channel. Exchange rates are greatest in the coarse-grained delta due to its permeability and morphology. Groundwater residence times range from hours to centuries and have fractal tails. Deltas are vanishing due to relative sea level rise. River diversion projects aimed at creating new deltaic land should also aim to restore surface water-groundwater connectivity, which is critical for biogeochemical processing in wetlands. We recommend designing diversions to capture more sand and thus maximize surface water-groundwater connectivity. © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84953438788&doi=10.1002%2f2015GL066156&partnerID=40&md5=011736dc5db7561dcc1aec5455f7753b
|
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/7986
|
| Appears in Collections: | 科学计划与规划
气候变化与战略
|
|
There are no files associated with this item.
|
|
作者单位: | School of Earth Sciences, Ohio State University, Columbus, OH, United States
|
| Recommended Citation: | |
Sawyer A.H.,Edmonds D.A.,Knights D.. Surface water-groundwater connectivity in deltaic distributary channel networks[J]. Geophysical Research Letters,2015-01-01,42(23).
|
|
|