Hydrological dynamics of temporary wetlands in the southern Great Plains as a function of surrounding land use
Hydrological dynamics of temporary wetlands in the southern Great Plains as a function of surrounding land use
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DOI：
10.1016/j.jaridenv.2014.05.006
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发表时间：
2014-10-01
影响因子：
2.7
通讯作者：
McIntyre, N. E.
中科院分区：
文献类型：
--
作者：
Collins, S. D.;Heintzman, L. J.;McIntyre, N. E.
我们使用遥感图像来描述2008年至2011年德克萨斯州（Landsat 5 TM WRS-2 P30/R36）8404个临时淡水湿地（干地）的水文动态，比较已知的干湿期，并将其与100米范围内的土地利用相关。水文周期是高度可变的，峰值水的可用性发生在不同的季节，在不同的年份，变化多达两个数量级的日期。土地利用影响了洪水泛滥的可能性和持续时间，城市环境中的干盐湖被改造成延长水文周期的方式，而被农田包围的干盐湖经历了较短的水文周期：在四年的时间里，3726个干盐湖盆地从未包含积水，其中许多盆地被棉花、玉米、小麦或高粱包围。相比之下，25个干盐湖从未干涸，其中大多数被城市发展所包围。中位水文周期为17-109天，与2011年的异常干旱相比，2010年相对潮湿的年份更长。遥感有助于监测干盐湖地表水随土地使用而变化的波动情况，在没有地面水文记录的情况下提供了一种替代数据来源，并提供了季节性或短暂性湿地可能不存在的时间视角。(C)2014爱思唯尔有限公司版权所有。
We used remote sensing imagery to characterize the hydrological dynamics of 8404 temporary freshwater wetlands (playas) in Texas (Landsat 5 TM WRS-2 P30/R36) from 2008 to 2011, comparing known wet and dry periods, and related these to land use within 100 m. Hydroperiods were highly variable, and peak water availability occurred in different seasons in different years, varying by as much as two orders of magnitude with date. Land use affected the likelihood and duration of inundation, with playas in urban settings being modified in such a way as to extend hydroperiod, and playas surrounded by cropland experiencing shorter hydroperiods: 3726 playa basins never contained standing water during the four-year period, and many of these were surrounded by cotton, corn, wheat, or sorghum. In contrast, 25 playas never dried, and most of these were surrounded by urban development. Median hydroperiod was 17-109 days, being longer during the relatively wet year of 2010 compared to exceptional drought in 2011. Remote sensing was useful in monitoring playa surface water fluctuations as a function of land use, providing an alternative source of data in the absence of ground-based hydrological records, and granting a temporal perspective that may otherwise not exist for seasonal or ephemeral wetlands. (C) 2014 Elsevier Ltd. All rights reserved.