Late Pleistocene and Holocene lake fluctuations in the Sevier Lake basin, Utah, USA
Late Pleistocene and Holocene lake fluctuations in the Sevier Lake basin, Utah, USA
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美国犹他州塞维尔湖盆地晚更新世和全新世湖泊波动
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发表时间：
1988
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影响因子：
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通讯作者：
C. Oviatt
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作者：
C. Oviatt
塞维尔湖（Sevier Lake）是塞维尔湖盆地的一个现代湖泊，主要由塞维尔河（Sevier River）供水。在过去的12000年里，海狸河也是该湖的主要支流。邦纳维尔湖占据了塞维尔沙漠，直到它的海退阶段后期，当它下降到旧河床的门槛，这是塞维尔湖盆地和大盐湖盆地之间的分水岭的低点。甘尼森湖是塞维尔沙漠中海拔1390 m的浅淡水湖，从12000 ~ 10000年B. P.进入大盐湖盆地的盐湖，继续收缩。这两个盆地之间的水文历史的对比可能是由季风环流向北转移到塞维尔湖盆地，但不至于北大盐湖盆地。夏季降水和云量的增加可能使塞维尔湖盆地保持相对湿润。到10000年BP后不久，甘尼森湖已停止溢流，塞维尔河和海狸河已开始沉积细粒冲积物穿过湖床。在全新世早期和中期，塞维尔湖的海拔高度保持在1381米以下。在3000年至2000年BP期间，湖泊略有扩张，海拔约为1382.3 m。第二次膨胀，可能是在过去的500年里，达到了大约1379.8米。在1800年代中期，湖面海拔为1379.5米。塞维尔湖从1880年到1982年基本上是干燥的（1376米）。在1984-1985年，由于塞维尔河异常高的融雪径流，该湖扩大到20世纪的1378.9米。晚全新世高的塞维尔湖的立场是最有可能与来自西风气团的降水量增加。
Sevier Lake is the modern lake in the topographically closed Sevier Lake basin, and is fed primarily by the Sevier River. During the last 12 000 years, the Beaver River also was a major tributary to the lake. Lake Bonneville occupied the Sevier Desert until late in its regressive phase when it dropped to the Old River Bed threshold, which is the low point on the drainage divide between the Sevier Lake basin and the Great Salt Lake basin. Lake Gunnison, a shallow freshwater lake at 1390 m in the Sevier Desert, overflowed continuously from about 12 000 to 10 000 yr B.P., into the saline lake in the Great Salt Lake basin, which continued to contract. This contrast in hydrologic histories between the two basins may have been caused by a northward shift of monsoon circulation into the Sevier Lake basin, but not as far north as the Great Salt Lake basin. Increased summer precipitation and cloudiness could have kept the Sevier Lake basin relatively wet.By shortly after 10 000 yr B.P. Lake Gunnison had stopped overflowing and the Sevier and Beaver Rivers had begun depositing fine-grained alluvium across the lake bed. Sevier Lake remained at an altitude below 1381 m during the early and middle Holocene. Between 3000 and 2000 yr B.P. the lake expanded slightly to an altitude of about 1382.3 m. A second expansion, probably in the last 500 years, culminated at about 1379.8 m. In the mid 1800s the lake had a surface altitude of 1379.5 m. Sevier Lake was essentially dry (1376 m) from 1880 until 1982. In 1984–1985 the lake expanded to a 20th-century high of 1378.9 m in response to abnormally high snow-melt runoff in the Sevier River. The late Holocene high stands of Sevier Lake were most likely related to increased precipitation derived from westerly air masses.