Refine your search
Collections
Co-Authors
Journals
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Moharana, P. C.
- Quantitative Measurement of Arid Fluvial Processes: Results from an Upland Catchment in Thar Desert
Abstract Views :168 |
PDF Views:0
Authors
P. C. Moharana
1,
Amal Kar
1
Affiliations
1 Division of Natural Resources and Environment, Central Arid Zone Research Institute, Jodhpur – 342 003, IN
1 Division of Natural Resources and Environment, Central Arid Zone Research Institute, Jodhpur – 342 003, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 1 (2010), Pagination: 86-92Abstract
A quantitative study on fluvial processes was carried out in an upland stream catchment (9.3 ha) near Agolai in the NE of Jodhpur district in the Thar Desert in Rajasthan. The catchment of the studied second order ephemeral channel (1.0 - 1.4 km long and 1.0 - 1.5 m deep) has developed on a hill - rocky/gravelly pediment - colluvial plain sequence on rhyolite. Initial results of measurements of channel parameters during two significant runoff generating events of 42 mm and 52 mm in 2007 showed peak discharges of 20 m3s-1 (upstream) and 13 m3s-1 (downstream) that moved sediments (bedload) to distances of 43 m - 141 m in the upstream reach, 6-28 m in the middle reach and 63-95 m in the lower reach. The long profile and cross profile measurements showed a balance between load and discharge through a sequence of alternate deposition and erosion throughout the channel. Hypsometry curves revealed maximum erosion (7.7 cm) in the upper reach and aggradation (2.90 cm) in the lower reach. Cross profile measurements showed bank cuts (6 cm) and vertical incisions (1-2 cm) on the rocky-gravelly V shaped valley in the upper reach, incision (4- 30 cm) and localized higher deposition (10-12 cm) in the narrow (<1m) and deep (>1m) U shaped valleys in middle reach and mainly deposition (13 cm) on the wide (1-4 m) and shallow channels (0.1 to 0.2 m) in the lower reach.Keywords
Arid Catchment, Channel Morphology, Erosion, Hypsometry, Particle Movement, Ephemeral Flow, Monitoring, Thar Desert, Rajasthan.- Frost Heaves in the Cold Arid Leh–Ladakh Region: Observations on their Morphological Variability and Patterns as Indicators of Pastureland Degradation
Abstract Views :245 |
PDF Views:95
Authors
P. C. Moharana
1,
M. S. Raghuvanshi
2,
R. K. Bhatt
1,
R. K. Goyal
1,
R. K. Singh
1,
H. M. Meena
1,
Mahesh Kumar
1,
Stanzin Landol
3
Affiliations
1 ICAR-Central Arid Zone Research Institute, Jodhpur 342 003, IN
2 ICAR-National Bureau of Soil Survey and Landuse Planning, Nagpur 440 033, IN
3 ICAR-Central Arid Zone Research Institute, Regional Research Station, Leh, IN
1 ICAR-Central Arid Zone Research Institute, Jodhpur 342 003, IN
2 ICAR-National Bureau of Soil Survey and Landuse Planning, Nagpur 440 033, IN
3 ICAR-Central Arid Zone Research Institute, Regional Research Station, Leh, IN
Source
Current Science, Vol 119, No 5 (2020), Pagination: 799-807Abstract
This study analysed frost heave lands in the cold arid Leh–Ladakh region of the Himalaya, India through semi-detail field survey and remote sensing. Most of these sites are highland grasslands occurring along the alluvial plains of rivers in the Leh and Nubra valleys. The study identified the occurrence of some unique frost heave patterns whose morphometry varied from simple, isolated to complex ones with elongated, coalesced and superimposed bedforms. These lands can be further subdivided into vegetated and degraded types. The degraded forms exhibited several cracks, dry, collapsed and slump structures. Invasion of Cirsium arvense over native grass species, soil salinity and feeding pressure by livestock have been identified as major land degradation factors. C. arvense has replaced the native vegetation on frost heaves and has allowed Carex species to grow, which is known to degrade and deplete the pasture ecology.Keywords
Cold Arid Region, Frost Heaves, Morphological Variability And Patterns, Pastureland Degradation.- Desertification and Land Degradation : Concept to Combating
Abstract Views :100 |
PDF Views:68
Authors
Affiliations
1 ICAR-Central Arid Zone Research Institute, Jodhpur 342 003, IN
1 ICAR-Central Arid Zone Research Institute, Jodhpur 342 003, IN