Knowledge Resource Center for Ecological Environment in Arid Area
| Estimating Surface Water Presence and Infiltration for Intermittent Streams in the Semi-arid Southwest | |
| Nicholas;Hillary Dianne | |
| 出版年 | 2012 |
| 学位授予单位 | The University of Arizona. |
| 英文摘要 | Ephemeral streams with spatially and temporally variable flow are important ecological settings in semi-arid desert environments that until now have been poorly characterized. Our quantitative analysis explores how intermittent stream hydrology varies across geomorphic (mountain streams to desert washes) and climatic gradients (150-400 mm precipitation) in Southern Arizona. Stream channels were instrumented for the first time with a co-deployment of vertical profiles of subsurface temperature sensors, and electrical resistance (ER) sensors on the bed surface. HYDRUS 1-D was used to simulate vertical unsaturated flow, and differences along hydrologic, topographic, and climatic gradients were compared. Annual surface water presence varied < 1%-82% of the year, and reach-normalized infiltration water volumes were 20,000-2,500,000 m³/(km y). Surface water presence was correlated with geomorphic gradient, and infiltration volumes were correlated with surface water presence. This sensor co-deployment method has shown that ER sensors alone are necessary to estimate infiltration in semi-arid, poorly-sorted, coarse desert channels. |
| 英文关键词 | Infiltration Intermittent Recharge Temperature Hydrology Arid Electrical resistance |
| 语种 | 英语 |
| URL | http://hdl.handle.net/10150/238891 |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/246866 |
| 推荐引用方式 GB/T 7714 | Nicholas;Hillary Dianne. Estimating Surface Water Presence and Infiltration for Intermittent Streams in the Semi-arid Southwest[D]. The University of Arizona.,2012. |
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