Reclamation of a Sandy Desert Through Floodwater Spreading: II. Characterization of Clay Minerals in the Watershed and the Freshly-Laid Sediment
محل انتشار: مجله علوم و فناوری کشاورزی، دوره: 2، شماره: 3
سال انتشار: 1379
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 53
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شناسه ملی سند علمی:
JR_JASTMO-2-3_004
تاریخ نمایه سازی: 22 آبان 1402
چکیده مقاله:
The artificial recharge of groundwater (ARG), where practicable, is an easy and economical
method for desertification control in the arid and semi-arid zones where overpumping
has critically lowered the watertable. Although desiltation of floodwaters, which
is a prerequisite for the ARG, leads to rehabilitation of the eroded sites that house the
sedimentation basins (SBs), the gradual impermeability of these basins and infiltration
ponds by migrating phyllosilicates shortens the economic life of such projects. Therefore,
characterization of these minerals is necessary if treatments for their removal are to be
found. As soil erosion in the watershed that supplies the ARG systems with floodwater deteriorates
the land, and threatens the recharge facilities and other hydraulic structures
downstream with siltation, identification of the erosion source facilitates prioritization of
soil conservation activities. Clay mineralogical analysis has been developed in recent years
as a powerful tool in sediment source attribution. However, applicability of such methods
to cases in Iran requires regional studies. Sediment samples were collected at ۰-۱۰,۱۰-۲۰,
and ۲۰-۳۰ cm increments on two transects in the ۱st, ۴th and ۶th SBs in a Gareh Bygone
Plain ARG system. Rock samples were collected on the southern flank of the Bisheh Zard
Basin that supplies floodwater to the ARG systems. All samples were characterized by the
XRD method. Transmission--electron micrograph (TEM) of one sample was also obtained.
Chlorite, mica, smectite, and possibly kaolinite were detected in all samples. The
presence of palygorskite was revealed only in a TEM. The non - clay minerals were calcite,
dolomite, alkali and plagioclase feldspars, gypsum, halite and quartz. The common origin
of these inherited clay minerals precludes their utility in sediment source detection.
کلیدواژه ها:
نویسندگان
S. K. Mirnia
Tarbiat Modarres University, P.O. Box ۱۴۱۵۵-۴۸۳۸, Tehran, Islamic Republic of Iran.
S. A. Kowsar
Fars Research Center for Natural Resources and Animal Husbandry, P.O. Box ۷۱۳۶۵-۴۵۸, Shiraz, Islamic Republic of Iran.