TY - JOUR
T1 - Evaporation from a riparian system in a semi-arid environment
AU - Unland, Helene E.
AU - Arain, Altaf M.
AU - Harlow, Chawn
AU - Houser, Paul R.
AU - Garatuza-Payan, Jaime
AU - Scott, Paul
AU - Sen, Omer L.
AU - Shuttleworth, W. James
PY - 1998/3/30
Y1 - 1998/3/30
N2 - Measurements of micrometeorological variables were made for a complete annual cycle using an automatic weather station and two energy budget - Bowen ratio systems at a field site adjacent to the Santa Cruz River in southern Arizona. These data were used to provide the basis of an estimate of the evaporation from a one-mile long losing reach of a riparian corridor in this semi-arid environment. A remotely sensed map of vegetation cover was used to stratify the corridor into five categories of surface cover. The total evaporation was calculated as the area-weighted average of the measured evaporation for sampled areas of the two most common covers, and appropriate estimates of evaporation for the less common covers. Measurements showed a substantial, seasonally dependent evaporation from the taller, deep-rooted riparian cover in the study reach, while the short, sparse vegetation provided little evaporation. In terms of the volume of water evaporated from the study reach, the evaporation from irrigated agriculture accounts for almost half of the total loss, while the majority of the remaining evaporation is from the taller riparian vegetation covers, with about one-quarter of the total loss estimated as coming from obligatory phreatophytes, primarily cottonwood.
AB - Measurements of micrometeorological variables were made for a complete annual cycle using an automatic weather station and two energy budget - Bowen ratio systems at a field site adjacent to the Santa Cruz River in southern Arizona. These data were used to provide the basis of an estimate of the evaporation from a one-mile long losing reach of a riparian corridor in this semi-arid environment. A remotely sensed map of vegetation cover was used to stratify the corridor into five categories of surface cover. The total evaporation was calculated as the area-weighted average of the measured evaporation for sampled areas of the two most common covers, and appropriate estimates of evaporation for the less common covers. Measurements showed a substantial, seasonally dependent evaporation from the taller, deep-rooted riparian cover in the study reach, while the short, sparse vegetation provided little evaporation. In terms of the volume of water evaporated from the study reach, the evaporation from irrigated agriculture accounts for almost half of the total loss, while the majority of the remaining evaporation is from the taller riparian vegetation covers, with about one-quarter of the total loss estimated as coming from obligatory phreatophytes, primarily cottonwood.
KW - Evaporation
KW - Micrometeorological variables
KW - Riparian corridor
KW - Riparian vegetation
KW - Semi-arid environment
KW - Sonoran Desert
UR - http://www.scopus.com/inward/record.url?scp=0032030102&partnerID=8YFLogxK
U2 - 10.1002/(sici)1099-1085(19980330)12:4<527::aid-hyp597>3.0.co;2-r
DO - 10.1002/(sici)1099-1085(19980330)12:4<527::aid-hyp597>3.0.co;2-r
M3 - Article
AN - SCOPUS:0032030102
SN - 0885-6087
VL - 12
SP - 527
EP - 542
JO - Hydrological Processes
JF - Hydrological Processes
IS - 4
ER -