Catalogus

Zoeken

Zoeken kan via de modus 'eenvoudig zoeken' (één veld) of uitgebreid via 'geavanceerd zoeken' (meerdere velden). Zo kan je bv. zoeken op een combinatie van een auteursnaam (auteur), een jaartal (jaar) en een documenttype.

Boekenmand

Nuttige resultaten kan je aanvinken en toevoegen aan een mandje. De inhoud hiervan kan je exporteren of afdrukken (naar bv. PDF).

RSS

Op de hoogte blijven van nieuw toegevoegde publicaties binnen uw interessegebied? Dit kan door een RSS-feed (?) te maken van jouw zoekopdracht.

log in

Publicaties | Kaarten

nieuwe zoekopdracht

[ meld een fout in dit record ]

mandje (0): toevoegen | toon

---

Changes in filtering efficiency of plankton nets due to clogging under tow Smith, P.E.; Counts, R.C.; Clutter, R.I. (1968). Changes in filtering efficiency of plankton nets due to clogging under tow. J. Cons. - Cons. Perm. Int. Explor. Mer 32(2): 232-248. https://dx.doi.org/10.1093/icesjms/32.2.232 In: Journal du Conseil. Conseil Permanent International pour l'Exploration de la Mer: Copenhague. ISSN 0902-3232

---

Beschikbaar in	Auteurs
VLIZ: Open access 264671 [ download pdf ]

---

Trefwoord

Marien/Kust

---

Auteurs		Top
Smith, P.E. Counts, R.C. Clutter, R.I.

---

Abstract

The problem of clogging is inherent in sampling plankton and this paper reports a study of clogging rates in tests of design variables of plankton nets, such as mesh size, filtering area, and net form. Telemetering flow meters were used to determine the effects of these variables on the rate of clogging of pairs of plankton nets under tow in waters of different clarity. Metering of flow is necessary for evaluating clogging. A water clarity measurement is not useful for predicting clogging rate and the gross appearance of the net after the tow is not necessarily a reliable indicator of whether clogging has lowered filtration efficiency during the tow. Fine mesh nets with comparable mesh aperture area filter as well initially as do nets with larger apertures but clog much more rapidly. Compared to silk with mesh apertures 0.550 mm wide, nylon with apertures 0.333 mm, 0.201 mm and 0.101 mm wide clog 3, 5 and 35 times as rapidly. In the cylinder-cone nets of 0.333 mm nylon mesh, the volume filtered at more than 85% efficiency was increased six-fold by doubling the filtering area. An equation describing the relation of the ratio of filtering area to mouth area for 0.333 mm nylon is: where R is the ratio of filtering area to mouth area, V is the volume to be filtered and A is the mouth area of the net. The cylinder and cylinder-cone nets were superior in sustained filtration efficiency to cone-shaped nets. We attribute this advantage to the oscillations of the cylindrically placed mesh which tend to clean the mesh at a higher rate. An example is given of the method by which a new net was designed to lessen the probability of clogging.

---

Alle informatie in het Integrated Marine Information System (IMIS) valt onder het VLIZ Privacy beleid

Top | Auteurs