Papers by Robert Schemenauer
To enquire about document delivery, contact the IDRC Library at [email protected] or at 613-236-6... more To enquire about document delivery, contact the IDRC Library at [email protected] or at 613-236-6163 ext. 2578. / Pour plus de renseignements sur la livraison de documents, veuillez communiquer avec la bibliothèque du CRDI à [email protected] ou composer le ...
Taman Tasik Titiwangsa lakes are popular for water sport activity. Thus, it is important to keep ... more Taman Tasik Titiwangsa lakes are popular for water sport activity. Thus, it is important to keep the health of the lakes at an acceptable level for the optimum usage of water sport activity. The water quality index is used to assess the water quality condition of the lakes. Water quality index (WQI) and interim national water quality standards (INWQS) for Malaysia are used to monitor the health of the lakes. A total of two sample stations were collected at Lake 1 and Lake 2 of Taman Tasik Titiwangsa. Six selected parameters (biological oxygen demand, chemical oxygen demand, dissolved oxygen, pH, suspended solid and ammoniacal nitrogen) were used to calculate the water quality index. From the analysis, it showed that both Lake 1 and Lake 2 are Class II condition and visitors can use it for water sport activity. Several recommendations are noted to improve the WQI value for the use of Taman Tasik Titiwangsa visitors especially for water sport activity.
Between 1985 and 1991, the Chemistry of High Elevation Fog (CHEF) experiment was conducted on thr... more Between 1985 and 1991, the Chemistry of High Elevation Fog (CHEF) experiment was conducted on three mountains in southern Quebec, Canada. The CHEF project was linked with the Mountain Cloud Chemistry Project (MCCP) in the Appalachian Mountains of the USA. Measurements were made of liquid water content (LWC) as well as standard meteorological parameters (temperature, pressure, relative humidity, wind speed, wind direction and precipitation).
Journal of Environmental Quality, Jul 1, 2000
Selenium (Se) contamination of agricultural drainage water is a major environmental problem facin... more Selenium (Se) contamination of agricultural drainage water is a major environmental problem facing California agriculture. To demonstrate the potential effectiveness of biological volatilization in removing Se from contaminated water and soil, Se volatilization was determined under field conditions from a soil-plant (Salicomia bigelovii Ton.) treatment system in the San Joaquin Valley, California. Volatile Se was collected using an open-flow sampling chamber system, biweekly during the S. bigelovii growing season from February to September 1997, and monthly from September 1997 to January 1998. The rate of Se volatilization fluctuated under different field conditions during the study year, with an overall mean of 155 ± 25 |Ag Se m~2 d" 1. Biological volatilization removed 62 mg Se m~2 yr ', which accounted for 6.5% of the annual total Se input (958 mg Se m 2 yr" 1) to the S. bigelovii field. Forward trajectory analysis showed that the air mass that passed through the research area generally moved quickly out of the San Joaquin Valley within the first 24 h, probably transporting airborne Se from the research site toward the eastern Sierra Nevada in spring and fall, the southern mountainous areas in summer, and the Coast Mountain region in winter. This study suggests that biovolatilization represents an environmentally sound technology for managing Se-contaminated soil and agricultural drainage water. Future research will focus on establishing new means for enhancing Se volatilization in the field.
Journal of the Atmospheric Sciences, Nov 1, 1979
Journal of applied meteorology, Aug 1, 1979
Journal of Geophysical Research, 1987
The chemical and physical properties of a supercooled stratus cloud layer and surrounding clear a... more The chemical and physical properties of a supercooled stratus cloud layer and surrounding clear air covering southern Ontario on February 20, 1984, were studied with the objectives of identifying the processes responsible for the cloud water chemical composition. The cloud layer, which extended from circa 650 to 1050 m mean sea level, was bounded by a strong temperature inversion just at cloud top. The air below this inversion was well mixed vertically, as indicated by the near independence of concentrations of various trace gas species with altitude and by conservation of number concentration of particles from the surface to cloud top, with below-cloud aerosol number concentrations (0.2 < d < 3 #m) approximately equal to the sum of the interstitial aerosol and cloud droplet (2 < d < 30 #m) number concentrations. Fractional incorporation of aerosol sulfate into cloud water, determined by comparison of interstitial and cloud water sulfate concentrations, was in the range of 85-90%, similar to the result inferred from comparison of interstitial aerosol and cloud droplet number concentrations. Gas phase equivalent concentrations of cloud water species were the same (within experimental error) as the concentrations of aerosol and soluble trace gas species in the below-cloud air. These results suggest that the dominant processes determining cloud water composition in this cloud layer were nucleation scavenging of sulfate aerosol and scavenging of gaseous HNO 3, with no significant contribution from reactive scavenging processes. ple, HNO3) present prior to cloud formation, and (3) reactive scavenging, whereby sparingly soluble gases react in cloud to form soluble compounds that are retained in the cloud water.
AMBIO: A Journal of the Human Environment, Jul 19, 1991
... collectors has been documented. One of the most exciting aspects of this resource is that in ... more ... collectors has been documented. One of the most exciting aspects of this resource is that in many regions the supply of water will be limited only by the number of collectors one chooses to install. In addition, since the source ...
The largest fog collection project in the world at this time is the FogQuest project in the villa... more The largest fog collection project in the world at this time is the FogQuest project in the village of Tojquia, in the Western Highlands of Guatemala. While much attention in the past has been devoted to developing the fog collection technology and finding and evaluating appropriate sites, there is also an opportunity in Guatemala to focus on implementation factors for long-term success in community fogcollection projects. Drawing from the themes of appropriate technology and integrated water-resource management, this paper details the participatory and management strategies undertaken by FogQuest in the ongoing fog collection project in Tojquia. Through a collaborative effort with the community association Mam Ma Qosquix, 30 large fog collectors are in place providing a daily average of 6000 liters of water to over 130 individuals. The current critical developments, it is argued, are to have a discussion on the successes and ongoing challenges in gender mainstreaming, to ensure women's participation and capacity building, and to ensure operation and maintenance capacity are built for the long term. Lessons learned include the importance of fostering trust as a precursor to collaborative effort and recognizing that an engagement will be for the longterm. True sustainability will be reached when the beneficiaries are themselves managers of a fog water collection system. By sharing our experiences we hope to encourage reflection on these important issues, which are relevant throughout the entire planning process, especially when establishing new initiatives.
Between 1985 and 1991, the Chemistry of High Elevation Fog (CHEF) experiment was conducted on thr... more Between 1985 and 1991, the Chemistry of High Elevation Fog (CHEF) experiment was conducted on three mountains in southern Quebec, Canada. The CHEF project was linked with the Mountain Cloud Chemistry Project (MCCP) in the Appalachian Mountains of the USA. Measurements were made of liquid water content (LWC) as well as standard meteorological parameters (temperature, pressure, relative humidity, wind speed, wind direction and precipitation).
A method to obtain estimates of the volume of fogwater collected by a tree canopy in complex terr... more A method to obtain estimates of the volume of fogwater collected by a tree canopy in complex terrain is described. Included are assumptions about the shape and spacing of the trees and their fogwater collection efficiency. A key component is the use of a computer model for wind flow in complex terrain. The fogwater volume results enable a mapping of wet deposition patterns of acidic ions. Fog chemistry data from the Roundtop Mountain complex in southern Quebec are used for calibration purposes.
Thesis University of Toronto 1972 Source Dissertation Abstracts International Volume 34 08 Section B Page 3976, 1972
Cuadernos de Investigación Geográfica, 1997
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Papers by Robert Schemenauer