Debris flow probabilities of ungaged tributaries to the Colorado River in Grand Canyon, AZ

This dataset represents 763 tributary canyons and/or watersheds adjacent to the Colorado River in Grand Canyon with associated debris flow probabilities from 2004. Also, these data include tributary canyon and/or watersheds to Glen Canyon and several smaller watersheds in Grand Canyon where debris flow data is currently unavailable. Historic probabilities of debris flow occurrence were estimated by modeling the known frequency distribution with drainage basin parameters observed to control the process by which debris flows initiate and travel to the river. Observations from 1984 through 2003 provide a 20-year record of all debris flows that reached the Colorado River in Grand Canyon, and repeat photography provides a 100 year record of debris flows from 147 tributaries. Owing to the limitations of the initial datasets and the focus on geomorphic change in the river corridor, debris flow probabilities pertain only to debris flows that reach the Colorado River.

本数据集涵盖了科罗拉多大峡谷（Grand Canyon）毗邻科罗拉多河（Colorado River）的763条支流峡谷及/或流域，并附带2004年的相关泥石流概率数据。此外，本数据集还包含格兰峡谷（Glen Canyon）的支流峡谷及/或流域，以及科罗拉多大峡谷内目前暂无泥石流数据的数个小型流域。历史泥石流发生概率通过以下方式估算：以观测得到的控制泥石流启动并输运至河道的流域参数，对已知频率分布进行建模。1984年至2003年的观测数据提供了长达20年的科罗拉多大峡谷内所有抵达科罗拉多河的泥石流记录，而重复摄影则提供了147条支流的100年泥石流记录。由于初始数据集存在局限，且本数据集聚焦于河道走廊的地貌变化，因此本次的泥石流概率仅针对最终抵达科罗拉多河的泥石流。