A significant part of Hong Kong has hilly terrain with relatively short flow concentration time and, hence, is susceptible to the threat of flash floods and landslides during intense convective thunderstorms and tropical cyclones. For places like Hong Kong, a rainfall model that could adequately capture small-scale temporal and spatial variations would be highly desirable. The main challenge in rain-field modeling is to capture and describe the dynamic time-space evolution of the rainfall during rainstorm events. In this study, radar data with a high spatial (1 km2) and temporal (6 min) resolution of four rainstorm events in Hong Kong are analyzed. A geostatistical approach based on indicator variograms of rain-fields is used. The spatial structure of a rain-field is found to be highly anisotropic and should be adequately considered in the model. Variability of the spatial structure of a rain-field was described well by the main features of the variograms. Moreover, it is possible to identify whether multiple rainstorm centers exist by comparing the mean length and range. In order to establish reliable statistics on the spatial and temporal structure of rain-fields in Hong Kong, this approach could be applied to a large set of rainstorm events in this same region in the future.
GoForth, NC Case Study
ABSTRACT Trap & Treat® BOS 200® was used to remediate petroleum hydrocarbon impacted groundwater within fractured bedrock and overburden soil at a former retail gasoline site in North Carolina. After a thorough remedial design characterization was completed, BOS 200® was surgically injected over two field events to successfully achieve the site cleanup goals. CHALLENGES The site was formerly a general store with two 1,000 gallon USTs; the primary constituents of concern were Benzene, Toluene,...
Case study - Mazzei airjection aeration system installed in Alabama Field Erected WWTP
Activated Sludge Treatment in a Municipal Sewage Treatment Plant. Huntsville, ALThe Problem: A design/build contractor needed a quiet, efficient aeration system for a 250,000 GPD field erected WWTP. This plant was to be located adjacent to a school. A restriction on ambient noise at the location of the proposed WWTP required a quiet aeration process.The Solution: The project engineer selected a Mazzei AirJection aeration system for the project, primarily due to the success he had with the Mazzei aeration design...
Case study - Boonsawang, Thailand
While shrimp and prawn production still represent the highest volumes in Thailand, an increasing number of farms started to diversify into other species. Private hatcheries and nurseries now supply the market with weaned fry for species such as barramundi and sea bass.Boonsawang Co. in Chonburi, owned by Suthi Mahalao, also exports fry to Vietnam, Malaysia, Singapore, Taiwan, Australia and Israel. In addition, Suthi runs his own sea bass farm and is a feed distributor to farms in the province.50 speciesMore than...
Case Study - Manure Magic
Manure Magic is a patented product that can help support successful manure management programs throughout the world, such as field applications as fertilizer, because of its ability to liquefy the manure, which makes it much easier to administer.Application ExamplesThe increase in regulatory requirements in dealing with animal waste solids has required growers to closely evaluate their internal precesses and disposal options. ManureMagic utilizes our patented DryLet Support System to deliver >200 billion...
Ceresco Dam Case Study
Global was contracted by Terra Contracting Services, LLC to serve as Water Treatment Specialists in response to the 2010 Enbridge Oil Spill along the Kalamazoo River. An energy pipeline rupture caused 877,000 gallons of heavy crude oil to spill into Talmadge Creek in Calhoun County, Michigan, which flows into the Kalamazoo River. Global engineered a processing plant for material and slurry dredged from the region upstream of the Ceresco Dam. Material and slurry were pumped from the 4 dredges to the 14 acre...