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)
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000 -LEADER | |
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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 |
No items available.