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TitleTRANSFORMATION OF POINT RAINFALL TO AREAL RAINFALL BY ESTIMATING AREAL ...
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Page 1

TRANSFORMATION OF POINT RAINFALL TO AREAL RAINFALL BY

ESTIMATING AREAL REDUCTION FACTORS, USING RADAR DATA, FOR

TEXAS





A Thesis

by

TARUN DEEP GILL




Submitted to the Office of Graduate Studies of
Texas A&M University

in partial fulfillment of the requirements for the degree of


MASTER OF SCIENCE






May 2005









Major Subject: Civil Engineering

Page 2

TRANSFORMATION OF POINT RAINFALL TO AREAL RAINFALL BY

ESTIMATING AREAL REDUCTION FACTORS, USING RADAR DATA, FOR

TEXAS



A Thesis

by

TARUN DEEP GILL


Submitted to the Office of Graduate Studies of

Texas A&M University
in partial fulfillment of the requirements for the degree of



MASTER OF SCIENCE



Approved as to style and content by:



_________________________ _________________________
Francisco Olivera Anthony Cahill

(Chair of Committee) (Member)




________________________ _________________________
Raghavan Srinivasan David Rosowsky

(Member) (Head of Department)






May 2005



Major Subject: Civil Engineering

Page 87

75

The multisensor estimates can reflect a significant amount of human interaction,

with the forecasters at the RFCs being responsible for their assembly (Durrans et al.,

2003). They may decide to alter seemingly suspect gauge reports or insert “pseudo

gauges and reports” (Durrans et al., 2003). Part of human interaction may involve

making changes to account for quality control of raw data and its analysis. Certain

adjustment may also be carried out which include draw in and deletion of precipitation

amounts and areas. Also sometimes, certain manual “reruns” i.e reanalysis of the data

can lead to alterations alter in the data. Unfortunately, archives of alterations have not

been maintained and therefore it is very difficult to detect the changes in the original

records (Durrans et al., 2003).

It is recognized from the study that the available data records are much too short

to enable reliable verification of the MPE data. An explanation for the difference

between the Stage III data and the MPE data is not clear. Short data records and the

kind of algorithm used in the processing of the data may be partly to blame.

Page 88

76

Problems may lie with the radars or with the PPS processing algorithms

because annual maximum precipitation values maybe systematically biased as a result

of noise reduction or other factors like volume averaging. This leaves room for future

research for the isolation of these problems and implementation of corrective measures

to rectify these problems.

But all said and done MPE data, if correctly quality controlled, not only reduces

small scale errors caused by rain gauges and radars but also account for spatial

variability in precipitation climatology (Seo, 2003). It also fills the data for the missing

areas and hence gives a near complete coverage of watershed area due to the fact that

satellite data fill in radar-data void areas. Ongoing improvements these days include

quality control using rain gauge and objective merging of satellite derived precipitation

estimates with radar and gauge data which will help in better estimation of the

precipitation estimation.

Page 174

162

Variation of RS1 for Region 6 (2001)

0

5

10

15

20

25

30

35

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

ARF Value

N
o.

o
f

P
oi

nt
s



Variation of RS1 for Region 7 (2001)

0

5

10

15

20

25

30

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

ARF Value

N
o.

o
f

P
oi

nt
s






Figure A13 Figure A14

Page 175

163

VITA



Tarun Deep Gill



ADDRESS

14004 Westward Drive, Fontana, California

(323)788-2786



EDUCATION

Master of Science in Civil Engineering, May 2005

Texas A&M University

Bachelor of Science in Civil Engineering, May 2001

Thapar Institute of Engineering and Techonology, India



EXPERIENCE

Texas A&M University, College Station, Texas (August 2003- December 2004)

Graduate Research Assistant

Development of a GIS based static storm model



This thesis was typed by the author.

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