Hydrologic, Geomorphic, & Chronologic Record of Paleofloods,Lake-Building Events & Climate Change During the Late Quat- ernary: Analysis of Integrated Fluvial/Pluvial Lake

9316443 威尔斯 气候变化和水文响应记录在许多沉积和地貌特征中，包括湖泊序列和河流地貌。 死亡谷的更新世曼利湖是第四纪河流排泄的终点。 径流的供应来自三个主要来源： 欧文斯河水系因冰川融水而流经内华达州山脉的东部斜坡，莫哈韦河因横贯山脉的地形抬升而流经圣贝纳迪诺山脉，阿马戈萨河流入布莱克和木材山脉的下游。 目前，阿马戈萨河是唯一流入死亡谷的河流。 该项目将解决1）如何获得的Amargosa河的地表流量，从anamolous气候条件下，或从地下水，和2）的相对作用的Amargosa河排放的贡献湖泊建设事件在死亡谷在第四纪晚期。 了解阿马戈萨河系统的地貌和水文演变非常重要，原因如下：（1）在第四纪晚期，它为死亡谷的总潜在流域面积贡献了15，540平方公里（Hunt等人，（2）Amargosa河地表径流来自低海拔排水系统，可作为不受冰川作用或高海拔地形降水影响的晚第四纪气候状况的古气候指标。(3)Amargosa河流域位于气候/自然地理区的边缘，有可能表明河流/湖泊沉积物中保存的大规模气候波动。 (4)它排干了国家提议的位于内华达州尤卡山的高放射性废物储存库的潜在地点。 我们建议（a）重建阿马戈萨河第四纪晚期的洪水历史（B）确定洪水的现代水文和气候条件（c）重建死亡谷第四纪晚期的造湖事件（d）主要水系的第四纪晚期洪水历史及其与古气候动力学的关系。 ***

9316443 Wells Climate variations and hydrologic responses are recorded in numerous sedimentologic and geomorphic features, including lacustrine sequences and fluvial landforms. Pleistocene Lake Manly in Death Valley was the end point for river discharges during the Quaternary. The supply of runoff was from three major sources: The Owens River system draining the eastern slopes of the Sierra Nevada in response to glacial meltwaters, the Mojave River draining the San Bernardino Mountains in response to precipitation due to orographic uplift over the Transverse Ranges, and the Amargosa River which heads in the lower Black and Timber Mountains. Presently, the Amargosa is the only river to flow into Death Valley. This project will address 1) how the Amargosa River acquired its surface flow, from anamolous climatic conditions, or from groundwater, and 2) the relative role the Amargosa River discharge has in contributing to lake-building events in Death Valley during the late Quaternary. Understanding the geomorphic and hydrologic evolution of the Amargosa River system is important for the following reasons; (1) It contributions a significant 15,540 Km2 to the total potential drainage area of Death Valley in the late Quarternary (Hunt et al., 1966) (2) Amargosa River surface runoff comes from a low-elevation drainage system that may serve as a paleoclimatic indicator of late Quaternary climatic regimes unaffected by glaciation or high elevation orographic precipitation. (3) The drainage basin of the Amargosa River lies on the periphery of climatic/physiographic zones where it has the potential to indicate large-scale climatic fluctuations preserved in fluvial/lacustrine sediments. (4) it drains the potential site of the nations's proposed high-level radioactive waste repository at Yucca Mountain, Nevada. We propose to (a) reconstruct the late quaternary flood history of the Amargosa River (b) determine the modern hydrologic and climatic conditions for floo ding (c) reconstruct late Quaternary lake-building events in Death Valley and (d) the late Quaternary flood histories of the major drainages and their relationship to paleoclimate dynamics. ***