国家水模型中河道路径模型和参数的开发和评估

IF 2.6 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL
L. K. Read, D. N. Yates, J. M. McCreight, A. Rafieeinasab, K. Sampson, D. J. Gochis
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引用次数: 0

摘要

美国国家海洋和大气管理局部署了国家水模型(NWM),以模拟美国大陆水文状态的运行预测。本文描述了NWM的地理空间河网(“水文结构”)、物理和参数,阐明了在有限观测的情况下大规模外推参数的挑战。针对2.7的子集评估一组基于回归的通道几何参数 万NWM河段,并介绍了河流复合河道方案。基于更广泛的NWM背景下的区域径流实验结果,与非复合配方相比,复合配方将均方根误差降低了2%,并将Nash-Sutcliffe中值效率提高了16%。根据美国山洪观测数据库对26个流域910个峰值流量事件进行的峰值事件分析显示,平均时间误差为3 h落后于观测结果。还测试了路由时间步长,增量为5分钟(默认,操作设置)和1小时。该模型在计算上是稳定的,能够传达洪峰,尽管过程线形状和洪峰时间发生了变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Development and evaluation of the channel routing model and parameters within the National Water Model

The National Water Model (NWM) was deployed by the National Oceanic and Atmospheric Administration to simulate operational forecasts of hydrologic states across the continental United States. This paper describes the geospatial river network (“hydro-fabric”), physics, and parameters of the NWM, elucidating the challenges of extrapolating parameters a large scale with limited observations. A set of regression-based channel geometry parameters are evaluated for a subset of the 2.7 million NWM reaches, and the riverine compound channel scheme is described. Based on the results from regional streamflow experiments within the broader NWM context, the compound channel reduced the root mean squared error by 2% and improved median Nash–Sutcliffe efficiency by 16% compared with a non-compound formulation. Peak event analysis from 910 peak flow events across 26 basins matched from the US Flash Flood Observation Database revealed that the mean timing error is 3 h lagged behind the observations. The routing time step was also tested, for 5-min (default, operational setting) and 1-h increments. The model was computationally stable and able to convey the flood peaks, although the hydrograph shape and peak timing were altered.

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来源期刊
Journal of The American Water Resources Association
Journal of The American Water Resources Association 环境科学-地球科学综合
CiteScore
4.10
自引率
12.50%
发文量
100
审稿时长
3 months
期刊介绍: JAWRA seeks to be the preeminent scholarly publication on multidisciplinary water resources issues. JAWRA papers present ideas derived from multiple disciplines woven together to give insight into a critical water issue, or are based primarily upon a single discipline with important applications to other disciplines. Papers often cover the topics of recent AWRA conferences such as riparian ecology, geographic information systems, adaptive management, and water policy. JAWRA authors present work within their disciplinary fields to a broader audience. Our Associate Editors and reviewers reflect this diversity to ensure a knowledgeable and fair review of a broad range of topics. We particularly encourage submissions of papers which impart a ''take home message'' our readers can use.
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