Field techniques for estimating downstream changes in discharge of gravel-bedded ephemeral streams: a case study in southern Tunisia

1995 ◽  
Vol 30 (3) ◽  
pp. 283-294 ◽  
Author(s):  
Kevin White
Keyword(s):  
Ephemeral Streams ◽  
Field Techniques ◽  
Southern Tunisia

scholarly journals Vertical Point Sampling with a Camera

2011 ◽  
Vol 28 (2) ◽  
pp. 61-65 ◽  
Author(s):  
Mark J. Ducey ◽  
John A. Kershaw
Keyword(s):  
Basal Area ◽  
Stand Density ◽  
Double Sampling ◽  
Point Sampling ◽  
Field Techniques ◽  
Potential Applications ◽  
Stand Density Index ◽  
Detectable Bias ◽  
Horizontal Point Sampling

Abstract Vertical point sampling has seen relatively little use in practical forestry, in part because existing field techniques are difficult. We show how vertical point sampling can be implemented quickly and easily using a camera. We give tables and equations for calculating the height-squared factor, which plays a role similar to that of the basal area factor in horizontal point sampling. Some suggestions for choosing a height-squared factor are discussed, along with potential applications for further exploration. We illustrate the technique using a case study in southern Maine. Direct estimates with no statistically detectable bias were obtained using height-squared factors greater than 3. The results also suggested that the technique could be used as a correlate in double sampling for variables such as cubic volume, stand density index, and biomass, and possibly board foot volume as well.

Palaeoenvironments of the Continental Intercalaire fossil from the Late Cretaceous (Barremian-Albian) in North Africa: a case study of southern Tunisia

2013 ◽  
Vol 7 (3) ◽  
pp. 1165-1177 ◽  
Author(s):  
Younes Hamed ◽  
Samir Anwar Al-Gamal ◽  
Wassim Ali ◽  
Abederazzak Nahid ◽  
Hamed Ben Dhia
Keyword(s):  
Late Cretaceous ◽  
North Africa ◽  
Southern Tunisia ◽  
Continental Intercalaire

Use of geochemical, isotopic, and age tracer data to develop models of groundwater flow: A case study of Gafsa mining basin-Southern Tunisia

2014 ◽  
Vol 100 ◽  
pp. 418-436 ◽  
Author(s):  
Younes Hamed ◽  
Riadh Ahmadi ◽  
Abdeslam Demdoum ◽  
Salem Bouri ◽  
Imed Gargouri ◽  
...  
Keyword(s):  
Groundwater Flow ◽  
Southern Tunisia
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