منابع مشابه
A preferential flow leaching index
[1] The experimental evidence suggests that for many chemicals surface runoff and rapid preferential flow through the shallow unsaturated zone are significant pathways for transport to streams and groundwater. The signature of this is the episodic and pulsed leaching of these chemicals. The driver for this transport is the timing and magnitude of rainfall events which trigger rapid flow and the...
متن کاملPreferential Leaching of Pinitol from Soybeans during Imbibition.
Sugars and cyclitols leached from soybeans (Glycine max var Sparks) during imbibition were assayed as a function of time. Pinitol leached many times faster than carbohydrates. During the initial 20 minutes of imibition, the pinitol/carbohydrate ratio was 3.4, declining to 0.29 for fully imbibed seeds. The value for dry soybeans was 0.14. Hypochlorite treatment of seeds more than doubled the rat...
متن کاملPreferential Flow Paths
Laboratory soil column experiments were conducted to study the distribution of preferential flow paths resulting from removal of fine-size clay particles. These experiments specifically studied the influence of clay (kaolinite) percentage in sand-clay mixtures and the effect of hydraulic gradients on pore evolution. Analysis of the effluent during the experiments indicated that clay particles w...
متن کاملInherited drainage - paleochannels and preferential groundwater flow
It is suggested that in a localized remnant of Kalahari sand at Dufuya, central Zimbabwe, groundwater flows in an integrated pattern inherited from the paleochannel network of the underlying gneiss. Contact springs occur at discrete localities along the Kalahari sand/gneiss boundary and are associated with spring sapping and land surface subsidence. Subsidence is presumed to be due to preferent...
متن کاملDye staining and excavation of a lateral preferential flow network
Papers published in Hydrology and Earth System Sciences Discussions are under open-access review for the journal Hydrology and Earth System Sciences Abstract Preferential flow features have been found to be important for runoff generation, solute transport, and slope stability in many areas around the world. Although many studies have identified the particular characteristics of individual feat...
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ژورنال
عنوان ژورنال: Water Resources Research
سال: 2009
ISSN: 0043-1397
DOI: 10.1029/2008wr007265