Assessing the effect on streamflow of two snow dominated watersheds in Sierra Nevada, California using hydrologic modeling in GIS PDF Download
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Author: Mo Lan Choi
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Category :
Languages : en
Pages : 0
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Author: Mo Lan Choi
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Category :
Languages : en
Pages : 0
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Author: Anne E Jeton
Publisher:
ISBN:
Category : Climatic changes
Languages : en
Pages : 58
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Author: Imtiaz-Ali M. Kalyan
Publisher:
ISBN:
Category : Climatic changes
Languages : en
Pages : 130
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California's water resources vary throughout the state owing to the regions varying topography, diverse climate, and the distribution of precipitation. Most of the state's precipitation falls over the northern coastal range and the western slopes of the Sierra Nevada Mountains. Winter snowpack that accumulates within these mountain basins serves as an efficient means of natural water storage. Moreover, the state's two massive water conveyance systems, the State Water Project (SWP) and the Central Valley Project (CVP), are integrally dependent upon winter snowpack accumulation, and subsequent spring snowmelt runoff. The SWP and CVP's extensive network of reservoirs, pipes, and aqueducts are engineered to collect and transport water from the snowcapped Sierra Nevada Mountains where it is plentiful, to farmland and urban communities where it is scarce but in greatest demand. However, increased warming within these mountain basins is causing a declined winter snowpack, altering the fraction of precipitation occurring as snow, and changing the timing of snowmelt derived streamflow. The loss of this immense amount of naturally occurring stored water, and its earlier arrival at the downstream reservoirs, has profound implications on the state's existing water management infrastructure. This work attempts to address these water management challenges that lie in the foreseeable future. Using a binary based deterministic approach, and a climatologically record of temperature and precipitation, "at-risk" snow dominated regions were identified throughout the Feather River Basin, and nested basins of the San Joaquin Watershed. These "at-risk" regions represent locations that would be the first to transition from a snow dominated, to a rain dominated precipitation regime under projected future warming scenarios. Future warming projections ranging from 1°C to 4°C were analyzed relative to the 1971-2000 base period. Results show that if warming trends considered by the IPCC 2007 report to be highly likely continue, nearly all snow dominated regions existing between 1500 and 2100 m in the San Joaquin Watershed would become rainfall dominated. Within the Feather River Basin, in the Sacramento Watershed, implications are even more alarming. A 3°C warming in February would result in approximately 87% of the regions previously snow covered area (SCA) becoming rainfall dominated; only 12% of the basin would remain snow covered. The decline of winter snowpack within all six study basins is closely correlated with elevation and average winter temperatures. Lower elevation, snow dominated regions near the rain to snow transition zone are highly sensitive to warmer temperatures relative to higher elevation, colder snow dominated regions. Furthermore, warming during high precipitation months, from December to February, would yield the largest reductions in loss of Snow Water Equivalent (or SWE). The loss of this immense amount of naturally occurring stored water, and its earlier arrival at the downstream reservoirs poses challenges and opportunities for California's water managers. For reservoir managers, adapting to a rapidly changing climate would require updating rigid flood control rule curves that were established based on hydrological trends during the first half of the twentieth century. Developing greater flexibility into flood-control rule curves could allow reservoir managers to store more water in the winter, thereby mitigating the consequences of snow loss from natural stored water sources. Faced with an expanding population and increased strains on water resources availability, sustaining future water demands hinges on developing adaptive water management strategies. By understanding basin and, at a finer scale, elevation specific vulnerability to snow loss due to warming, water managers can begin to guide effectual adaptation strategies.
Author: Lee Harold MacDonald
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Category : Logging
Languages : en
Pages : 820
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Both forest harvest and cloud-seeding are believed to enhance late spring runoff in snow-dominated areas. This study used a water balance model and a field experiment to investigate the linkage between late-season snowmelt and streamflow in the mid-elevation snow zone of California's Central Sierra Nevada. The field experiment was designed to simulate the hydrologic effects of cutting small forest openings. The simulated snowmelt also created a statistically significantly lag in the soil moisture drying curves between the treated and the control plots. Tensiometer and soil moisture block data indicated that this difference persisted for at least 4-6 weeks in most locations. A bromide tracer was added to the simulated snowmelt. Less than one percent of the tracer left the catchment as surface flow in the summer following the experiment. The highest bromide concentrations were observed during high runoff events in the following winter. Suction lysimeters indicated that the initial movement of the tracer was largely consistent with a simple advection equation. Declining hydraulic conductivity due to evapotranspiration and gravitational drainage was the most important factor limiting the downslope movement of the simulated snowmelt. The porous bedrock in the experimental catchment makes it difficult to extrapolate to other sites. Nevertheless, the results suggest that cutting small forest openings to capture snow and delay melt will prove ineffective. Delayed or increased snowmelt can enhance late spring and early summer streamflow, but it is unlikely to increase late summer streamflow in the mid-elevation snow zone of the Central Sierra Nevada.--Adapted from abstract.
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Category : Biotic communities
Languages : en
Pages : 1584
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Author: Raymond Martin Rice
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Category : Lumbering
Languages : en
Pages : 164
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Author: Jeff Dozier
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Category : Acid deposition
Languages : en
Pages : 300
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Author: Katie Marie Jorgensen
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Category : Watersheds
Languages : en
Pages : 68
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This study hypothesizes the effects of global climate change on the hydrologic regime of West-Central Montana, focusing on the North Fork of Elk Creek, a 6.6 km2 (2.6 mi.2) Experimental Watershed. This is important to understand in snowmelt-dominated watersheds, as it is already well documented by current trends and future climate projections that the natural hydrologic regime is experiencing alterations. There have been shifts in the 20th century of the timing of snowmelt trending towards an earlier spring peak flows and declines in the overall snow water equivalent (Regonda et al., 2005; Mote et al., 2005; Hamlet et al., 2005). The goals for this study are to analyze for significant changes in the timing of important hydrologic events, and determine how discharge throughout the year will be altered in the Elk Creek Experimental Watershed (ECEW). To address these issues, a semi-spatial hydrologic model is employed, and run using current meteorological data and under downscaled climate-change scenarios conditions, under three relevant time periods. Snowmelt Runoff Model (SRM) is deterministic and conceptual and is used to generate streamflow in snowmelt dominated basins by the degree-day method (Martinec, 1985). Data is gathered from two SNOTEL sites located within the watershed and streamflow collected directly on the North Fork of Elk Creek. The specific metrics that will be statistically analyzed are mean summer and winter flows, and trends in peak flow and center of mass date timing (Wenger et al., 2009; Regonda et al., 2005). These results can be useful for management purposes because changes in the way water is released from the mountains affects water storage, flooding, and overall watershed resilience such that current practices may need to be accordingly adjusted.
Author: R. L. Boone
Publisher:
ISBN:
Category : Artificial groundwater recharge
Languages : en
Pages : 148
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Author: Robert Arnold Merriam
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ISBN:
Category : Forest fires
Languages : en
Pages : 52
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