An Ecosystem Study Of Kapyong Creek In Korea - Team A

Ⅱ. Microhabitat

survey date; 2000.4.1

Investigator; (team A) Min-A Kim (9831007)
Young-A Ban (9831062)
Youn-Jin Jo (9831159)
Seung-eun Heo (9831313)


* Method:

1. depth (average value of three teams)
- take the average of the depth of the water by 1 meter intervals.
2. the width of the water (average value of three teams)
- measure the distance between both ends in a river.
3. the width of the river (average value of three teams)
- measure the distance between both riverbanks in a river
4. substrate (average value of three teams)
- decide any place in a river, then dig the ground to a depth
of 10 cm , strain the gathered gavel through a sieve.
After classifying the strained gravel by Wentworth classification, weigh those.
5. the speed of running fluid (average value of three teams)
- After taking measurements by vertically putting a ruler into
a running water in the same direction, turn the ruler to a
90 degree angle and then take down the changed measurements.


* Result

·average depth ; 20.2 cm
·average the width of the water ; 7.46 m
·average the width of the river ; 25.9 m

·substrate

Name	size(mm)	Phi Scale	무게(kg)	%
Boulder	>256	-8	0	0
Cobble	64-256	-6,-7	3.1	13.8
Large pebble	32-64	-5	2.23	9.9
Small pebble.	16-32	-4	2.26	10.1
Coarse gravel	8-16	-3	0.8	3.6
Medium gravel	4-8	-2	9.03	40.2
fine gravel	2-4	-1	0.45	2.0
Very coarse sand	1-2	0	0.2	0.9
Coarse sand	0.5-1	1	3.59	16.0
Medium sand	0.25-0.5	2	0.175	0.8
Fine sand	0.125-0.25	3	0.253	1.1
Very fine sand	0.0025-0.125	4	0.35	1.6
Silt	0.0039-0.0625	5,6,7,8	0	0
Clay	<0.0039	9	0	0

·the speed of running fluid ;
vertical : 30 cm
horizontal : 35 cm
∴ average the speed of running fluid :
= 99.0 cm/sec


* Discussion

When we examined the river, the temperature of the water was so low that we couldn't hold out even for a second. we underwent hardships, since we should be in the river for a longtime to measure the width of the water and the river and the depth.

In the result of every team, we could find the noticeable differences that seem to be influenced by winds in measured values of the speed of running fluid.

We should dig to the bottom of the river to gather the bottom substances. Digging the ground in different depth, every group gained different values. And microscopic substances in the bottom of the river could be clearly seen. That might be because we examined the upper part of the river.

* Reference

-「water investigation and analysis」, Sung-Haun Yoo etc 1998
-「environment microorganism experiment」, Ju-Young Kim etc 1997