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Salt dynamics in isolated, freshwate...

University of California, Berkeley.

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Salt dynamics in isolated, freshwater wetlands.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Salt dynamics in isolated, freshwater wetlands./
作者:	Huckelbridge, Katherine Haines.
面頁冊數:	222 p.
附註:	Adviser: John A. Dracup.
Contained By:	Dissertation Abstracts International69-09B.
標題:	Engineering, Environmental. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3331647
ISBN:	9780549834670

Salt dynamics in isolated, freshwater wetlands.
Huckelbridge, Katherine Haines.

Salt dynamics in isolated, freshwater wetlands. - 222 p.

Adviser: John A. Dracup.

Thesis (Ph.D.)--University of California, Berkeley, 2008.

A combination of field studies, laboratory experiments and modeling were used to investigate salt dynamics at two different wetlands: the Cienega de Santa Clara (Cienega), a large, permanent, brackish-water wetland located in the Colorado River Delta in Sonora, Mexico, and Curlew Flat, a small seasonal, freshwater wetland located in the San Joaquin River basin of California. The objectives of this research were to address (1) the mixing and transport of dissolved salts in the water column; (2) the exchange of salt at the soil-water interface; and (3) the effects of various management activities on salt dynamics in permanent and seasonal wetlands.

ISBN: 9780549834670Subjects--Topical Terms:

783782
Engineering, Environmental.

Salt dynamics in isolated, freshwater wetlands.
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502 $a Thesis (Ph.D.)--University of California, Berkeley, 2008.
520 $a A combination of field studies, laboratory experiments and modeling were used to investigate salt dynamics at two different wetlands: the Cienega de Santa Clara (Cienega), a large, permanent, brackish-water wetland located in the Colorado River Delta in Sonora, Mexico, and Curlew Flat, a small seasonal, freshwater wetland located in the San Joaquin River basin of California. The objectives of this research were to address (1) the mixing and transport of dissolved salts in the water column; (2) the exchange of salt at the soil-water interface; and (3) the effects of various management activities on salt dynamics in permanent and seasonal wetlands.
520 $a Salt dynamics at the Cienega were explored using an integrated model evaluating wetland hydrology, hydrodynamics, salinity and vegetation, developed to predict changes in salt distribution, wetland size and vegetation cover. Model results indicate that wetland salinity at this coastal, desert wetland is controlled largely by wetland hydrology, specifically wetland inflow and evapotranspiration rates, and internal mixing processes. Vegetation also plays a minor role by regulating evapotranspiration rates based on wetland salinity concentrations. Future management of the quantity and quality of the wetland's inflow will ultimately determine the long-term salt balance and thus the ecological integrity of the Cienega.
520 $a Field and modeling studies of salt dynamics at Curlew Flat focused on describing the effects of wind and vegetation on internal mixing, and examining spatial and temporal trends in wetland salinity. Results indicate that high-velocity, sustained winds have the potential to drive internal mixing on short timescales. However, due to the long duration of the flooded period, these wind events are likely to be a significant driver of wetland salt dynamics only in cases where the event occurs shortly before wetland draw down. Vegetation provides a more consistent influence on mixing in isolated wetlands. Plants with taller, more rigid stems impede wetland velocities, resulting in reduced circulation in these areas, and increase the potential for localized areas of high salinity. Wetland managers can thus influence wetland circulation through manipulation of vegetative communities.
520 $a Investigations into the spatial and temporal distribution of salt in Curlew Flat indicate that salinity dynamics are primarily driven by the wetland inflow. The inflow acts as the primary source of salt, as well as the major driving mechanism for internal mixing. Applying the Cienega modeling framework to the Curlew Flat flooded period confirmed this assertion. Results also show that maintaining full flooding throughout the flooded period and promoting an adequate flow through the wetland will help avoid excessive salt build-up in the wetland.
520 $a Fluxes of salt across the soil/water interface were examined through a series of four soil core experiments. Results showed that fluxes of salt from the soil column into the water column were present during all four wetland management phases: flood-up, the flooded period, draw down and re-flooding. The magnitude of these fluxes was greatest during periods of wetting and drying. However, the largest mass of salt was released into the water column during the flooded period, due to its long duration. Results also showed that the total load of salt released into the water column is smaller when employing a fast flood-up or draw down as compared to a slow flood-up or draw down, indicating that the best management strategy for minimizing salt loads discharged into the water column is a fast flood up and a fast draw down.
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