Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Development and application of a spatially-distributed Arctic hydrologicaland thermal process model (ARHYTHM)
Autore:
Zhang, Z; Kane, DL; Hinzman, LD;
Indirizzi:
Univ Alaska Fairbanks, Inst No Engn, Water & Environm Res Ctr, Fairbanks, AK 99775 USA Univ Alaska Fairbanks Fairbanks AK USA 99775 Ctr, Fairbanks, AK 99775 USA
Titolo Testata:
HYDROLOGICAL PROCESSES
fascicolo: 6, volume: 14, anno: 2000,
pagine: 1017 -
SICI:
0885-6087(20000430)14:6<1017:DAAOAS>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
SAR SATELLITE IMAGERY; ACTIVE LAYER; WATERSHED MODEL; ENERGY-BALANCE; SNOW HYDROLOGY; CLIMATE-CHANGE; TERRAIN; BASIN; ALASKA; EVAPOTRANSPIRATION;
Keywords:
spatially distributed hydrological model; arctic; soil moisture; snowmelt; evapotranspiration; streamflow; overland flow; subsurface flow; digital elevation model; permafrost; tundra;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
80
Recensione:
Indirizzi per estratti:
Indirizzo: Kane, DL Univ Alaska Fairbanks, Inst No Engn, Water & Environm Res Ctr, 460 Duckering Bldg, Fairbanks, AK 99775 USA Univ Alaska Fairbanks 460 Duckering Bldg Fairbanks AK USA 99775 A
Citazione:
Z. Zhang et al., "Development and application of a spatially-distributed Arctic hydrologicaland thermal process model (ARHYTHM)", HYDROL PROC, 14(6), 2000, pp. 1017

Abstract

A process-based, spatially distributed hydrological model was developed toquantitatively simulate the energy and mass transfer processes and their interactions within arctic regions (arctic hydrological and thermal model, ARHYTHM). The model first determines the flow direction in each element, thechannel drainage network and the drainage area based upon the digital elevation data. Then it simulates various physical processes: including snow ablation, subsurface flow, overland flow and channel flow routing, soil thawing and evapotranspiration. The kinematic wave method is used for conductingoverland flow and channel flow routing. The subsurface flow is simulated using the Darcian approach. The energy balance scheme was the primary approach used in energy-related process simulations (snowmelt and evapotranspiration), although there are options to model snowmelt by the degree-day methodand evapotranspiration by the Priestley-Taylor equation. This hydrologicalmodel simulates the dynamic interactions of each of these processes and can predict spatially distributed snowmelt, soil moisture and evapotranspiration over a watershed at each time step as well as discharge in any specified channel(s). The model was applied to Imnavait watershed (about 2.2 km(2))and the Upper Kuparuk River basin (about 146 km(2)) in northern Alaska. Simulated results of spatially distributed soil moisture content, discharge at gauging stations, snowpack ablations curves and other results yield reasonable agreement, both spatially and temporally, with available data sets such as SAR imagery-generated soil moisture data and field measurements of snowpack ablation, and discharge data at selected points. The initial timing of simulated discharge does not compare well with the measured data during snowmelt periods mainly because the effect of snow damming on runoff was not considered in the model. Results from the application of this model demonstrate that spatially distributed models have the potential for improving our understanding of hydrology for certain settings. Finally, a critical component that led to the performance of this modelling is the coupling of themass and energy processes. Copyright (C) 2000 John Wiley & Sons, Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 19:07:35