Panel studies of the detectability of change in water colour and clarity induced by discharge of inorganic suspensoids to a small stream / (Record no. 184494)

MARC details
000 -LEADER
fixed length control field 02501ca a2200349 4500
001 - CONTROL NUMBER
control field 135925
003 - CONTROL NUMBER IDENTIFIER
control field nz
005 - DATE AND TIME OF LATEST TRANSACTION
control field 20220519064006.0
008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION
fixed length control field 190507b ||||| |||| 00| 0 eng d
024 ## - OTHER STANDARD IDENTIFIER
Standard number or code OI8800308
035 ## - SYSTEM CONTROL NUMBER
System control number (Sirsi) a146025
100 1# - MAIN ENTRY--PERSONAL NAME
Personal name Davies-Colley, R. J.
Affiliation (NIWA. Hamilton)
245 10 - TITLE STATEMENT
Title Panel studies of the detectability of change in water colour and clarity induced by discharge of inorganic suspensoids to a small stream /
Statement of responsibility, etc R.J. Davies- Colley and D.G. Smith.
260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT)
Place of publication, distribution, etc Hamilton, N.Z. :
Name of publisher, distributor, etc Hamilton Science Centre,
Date of publication, distribution, etc 1990.
300 ## - PHYSICAL DESCRIPTION
Extent 27 leaves :
Other physical details illustrations, graphs, diagrams ;
Dimensions 30 cm
490 1# - SERIES STATEMENT
Series statement Internal report / Water Quality Centre, Hamilton ;
Volume number/sequential designation no. 89/5
500 ## - GENERAL NOTE
General note Missing page 6 in both hard and electronic copies.
520 ## - SUMMARY, ETC.
Summary, etc n spite of the aesthetic importance of turbidity in waters, apparently no studies of human detectability of turbidity changes have been made. In this study finely divided limestone (calcite) was injected into a small natural stream (flow = 349 l s-1) and the resulting changes in water appearance were monitored instrumentally. Initially the stream bed (gravel and some sand) was clearly visible at depths of 760 mm or less through water of 1.5 m visual clarity (horizontal sighting range of a black disk). the cue to increased turbidity is not complete disappearance of bed features but may be partial obscuration or "fogging out" of such features. Median detection thresholds (just noticeable differences) in terms of reduction in visual clarity below background (initially with the bed clearly visible) were 12 and 10 % for two independent panels (each with n=11) who observed the visual changes as turbidity was increased ramp-fashion. This low detection threshold represents a remarkably high human sensitivity to turbidity change that may be generally applicable to small, clear streams.
650 #4 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name as entry element STREAMS
9 (RLIN) 19129
650 #4 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name as entry element RIPARIAN ZONES
9 (RLIN) 37729
650 #4 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name as entry element PASTURES
9 (RLIN) 17139
650 #4 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name as entry element WATER QUALITY
9 (RLIN) 25357
650 #4 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name as entry element WATER COLOUR
9 (RLIN) 46371
650 #4 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name as entry element CLARITY
9 (RLIN) 41564
650 #4 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name as entry element DISCHARGE
9 (RLIN) 178
650 #4 - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name as entry element NEW ZEALAND
9 (RLIN) 39580
700 1# - ADDED ENTRY--PERSONAL NAME
Personal name Smith, D. G.
710 2# - ADDED ENTRY--CORPORATE NAME
Corporate name or jurisdiction name as entry element Water Quality Centre (Hamilton, N.Z.)
9 (RLIN) 27704
773 0# - HOST ITEM ENTRY
Host Biblionumber 199357
Host Itemnumber 394962
Place, publisher, and date of publication Hamilton, [NZ] : The Centre, 1973?-1992?
Other item identifier J018104
Title Internal report / Water Quality Centre, Hamilton.
Record control number 158813
830 #0 - SERIES ADDED ENTRY--UNIFORM TITLE
Uniform title Internal report / Water Quality Centre, Hamilton
Volume number/sequential designation no. 89/5
942 ## - ADDED ENTRY ELEMENTS (KOHA)
Koha item type BOOK
Koha issues (borrowed), all copies 0
Source of classification or shelving scheme Universal Decimal Classification

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