A comparison of geostatistical procedures for spatial analysis of precipitation in mo
Current time: 06-18-2018, 12:24 PM
Users browsing this thread: 1 Guest(s)
Author: arshiakh
Last Post: arshiakh
Replies 0
Views 1079

A comparison of geostatistical procedures for spatial analysis of precipitation in mo
#1
A comparison of geostatistical procedures for spatial analysis of precipitation in mountainous terrain

Author: Donald L Phillips; Jayne Dolph; Danny Marks | Size: 1.3 MB | Format: PDF | Quality: Unspecified | Publisher: Elsevier | Year: 1992 | pages: 22 | ISBN: --


[Image: info.png]

Spatially distributed measurements or estimates of precipitation over a region are required for modelling of hydrologic processes and soil moisture for agricultural and natural resource management. Simple interpolation methods fail to consider the effects of topography on precipitation and may be in considerable error in mountainous regions. The performance of three geostatistical methods for making mean annual precipitation estimates on a regular grid of points in mountainous terrain was evaluated. The methods were: ( 1 ) kriging; (2) kriging elevation-detrended data; and (3) cokriging with elevation as an auxiliary variable. The study area was the Willamette River basin, a 2.9 million hectare region spanning the area between the Coast Range and the Cascade Range in western Oregon. Compared with kriging, detrended kriging and cokriging both exhibited better precision (as indicated by estimation coefficients of variation of 16 and 17% vs. 21%; and average absolute errors of 19 and 20 cm vs. 26 cm) and accuracy (as indicated by average errors of - 1.4 and -2.0 cm vs. -5.2 cm) in the estimation of mean annual precipitation. Contour diagrams for kriging and detrended kriging exhibited smooth zonation following general elevation trends, while cokriging showed a patchier pattern more closely corresponding to local topographic features. Detrended kriging and cokriging offer improved spatially distributed precipitation estimates in mountainous terrain on the scale of a few million hectares. Application of these methods for a larger region, the Columbia River drainage in the USA (57 million hectares), was unsuccessful due to the lack of a consistent precipitation-elevation relationship at this scale, Precipitation estimation incorporating the effects of topography at larger scales will require either piecewise estimation using the methods described here or development of a physically based orographic model.

[Image: download.png]
***************************************
Content of this section is hidden, You must be registered and activate your account to see this content. See this link to read how you can remove this limitation:

http://forum.civilea.com/thread-27464.html
***************************************






***************************************
Content of this section is hidden, You must be registered and activate your account to see this content. See this link to read how you can remove this limitation:

http://forum.civilea.com/thread-27464.html
***************************************




[Image: password.png]
***************************************
Content of this section is hidden, You must be registered and activate your account to see this content. See this link to read how you can remove this limitation:

http://forum.civilea.com/thread-27464.html
***************************************

[-] The following 4 users say Thank You to arshiakh for this post:
  • ska51, malc, Dell_Brett, kowheng
Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
Loading Pattern and Spatial Distribution of Dynamic Wind Load and Comparison of Wind TAFATNEB 0 1,105 09-05-2014, 02:40 PM
Last Post: TAFATNEB
Comparison of Static and Dynamic Pushover Analysis in Assessment of the Target Displa TAFATNEB 0 909 08-10-2014, 03:42 PM
Last Post: TAFATNEB
Comparison between Static and Dynamic Analysis of Elevated Water Tank” TAFATNEB 0 1,123 05-10-2014, 10:18 AM
Last Post: TAFATNEB
Plastic Buckling of Cylindrical Shells: A Theoretical Analysis and Comparison with Te asim99 0 1,300 05-04-2013, 04:33 PM
Last Post: asim99
Spatial and temporal scales in rainfall analysis — Some aspects and future perspectiv arshiakh 0 999 04-08-2013, 07:23 PM
Last Post: arshiakh



Users browsing this thread: 1 Guest(s)