Investigation of flow field in bays of Sanriku coast

Fiscal Year

2013

Title

Project and Theme

Project 1. Study on ecological succession of fisheries ground

Representative Organization: Tohoku University

Theme1. Environmental monitoring in coastal sea areas of Miyagi Prefecture

Representative person	Yoshinari Endo
Organization	Tohoku University
Department	Graduate School of Agricultural Science

Research Information

Period and Interval

2013/05/01 - 2014/03/31
twice a year - every month

Research Area

Onagawa Bay, Shizugawa Bay, Ogatsu Bay, Kesennuma Bay, Oppa Bay, Nagatsura-ura Lagoon
0062_R01_map01.pdf

Overview

To examin restoration process of marine and fishing ground environments, current measurements and water quality surveys are carried out in bays of Sanriku coast. These measuremets and surveys will let us understand the flow field in the bays and clarify influence of the flow field on spatio-temporal variations of the marine and fishing ground environments there.

Overview of the Observation

Research Point Table

Point

Name	os.01
Coordinates	38.404082,141.535657
Name	os.02
Coordinates	38.409218,141.533405
Name	os.03
Coordinates	38.419212,141.530583
Name	os.04
Coordinates	38.426697,141.528208
Name	os.05
Coordinates	38.434925,141.525833
Name	os.06
Coordinates	38.419212,141.516495
Name	os.07
Coordinates	38.426697,141.516667
Name	os.08
Coordinates	38.434182,141.516493
Name	os.09
Coordinates	38.441667,141.516667
Name	os.10
Coordinates	38.441667,141.508333
Name	os.11
Coordinates	38.431717,141.5
Name	os.12
Coordinates	38.42568,141.5
Name	os.13
Coordinates	38.419212,141.5
Name	os.14
Coordinates	38.411305,141.4815
Name	os.15
Coordinates	38.402972,141.474833
Name	os.16
Coordinates	38.419212,141.4815
Name	os.17
Coordinates	38.42568,141.4815
Name	os.18
Coordinates	38.431717,141.4815
Name	os.19
Coordinates	38.434638,141.468167
Name	os.20
Coordinates	38.441305,141.458167
Name	ss.01
Coordinates	38.665298,141.456312
Name	ss.02
Coordinates	38.659133,141.456312
Name	ss.03
Coordinates	38.650632,141.456312
Name	ss.04
Coordinates	38.650632,141.470328
Name	ss.05
Coordinates	38.659133,141.470328
Name	ss.06
Coordinates	38.668333,141.470328
Name	ss.07
Coordinates	38.672188,141.484343
Name	ss.08
Coordinates	38.66578,141.484343
Name	ss.09
Coordinates	38.642467,141.484343
Name	ss.10
Coordinates	38.649395,141.484343
Name	ss.11
Coordinates	38.643168,141.502362
Name	ss.12
Coordinates	38.65006,141.500293
Name	ss.13
Coordinates	38.659068,141.497588
Name	ss.14
Coordinates	38.66578,141.495573
Name	ss.15
Coordinates	38.669952,141.49432
Name	ss.16
Coordinates	38.672188,141.493648
Name	ss.17
Coordinates	38.659617,141.468683
Name	ss.18
Coordinates	38.646282,141.493353
Name	ss.19
Coordinates	38.670262,141.477337
Name	ss.20
Coordinates	38.650632,141.46332
Name	og.01
Coordinates	38.518693,141.46995
Name	og.02
Coordinates	38.516685,141.483663
Name	og.03
Coordinates	38.5156,141.482183
Name	og.04
Coordinates	38.513823,141.47984
Name	og.05
Coordinates	38.507173,141.489587
Name	og.06
Coordinates	38.508717,141.49055
Name	og.07
Coordinates	38.51013,141.492387
Name	og.08
Coordinates	38.502412,141.490565
Name	og.09
Coordinates	38.507467,141.50262
Name	og.10
Coordinates	38.508235,141.51094
Name	og.11
Coordinates	38.505002,141.505938
Name	og.12
Coordinates	38.502267,141.501583
Name	og.13
Coordinates	38.499502,141.497058
Name	og.14
Coordinates	38.498263,141.513518
Name	og.15
Coordinates	38.495383,141.508133
Name	og.16
Coordinates	38.492597,141.502742
Name	og.17
Coordinates	38.488723,141.496258
Name	og.18
Coordinates	38.478733,141.502397
Name	og.19
Coordinates	38.482268,141.506718
Name	og.20
Coordinates	38.487083,141.512083
Name	og.21
Coordinates	38.490627,141.515883
Name	og.22
Coordinates	38.484513,141.527637
Name	og.23
Coordinates	38.481835,141.516487
Name	ks.01
Coordinates	38.901402,141.582483
Name	ks.02
Coordinates	38.89407,141.587128
Name	ks.03
Coordinates	38.891507,141.594145
Name	ks.04
Coordinates	38.882308,141.598362
Name	ks.05
Coordinates	38.871078,141.597967
Name	ks.06
Coordinates	38.854497,141.598153
Name	ks.07
Coordinates	38.837445,141.597028
Name	ks.08
Coordinates	38.841402,141.604432
Name	ks.09
Coordinates	38.843022,141.6077
Name	ks.10
Coordinates	38.878837,141.603797
Name	ks.11
Coordinates	38.88019,141.615088
Name	ks.12
Coordinates	38.886218,141.618647
Name	ks.13
Coordinates	38.887858,141.627922
Name	ks.14
Coordinates	38.891538,141.632788
Name	ks.15
Coordinates	38.882757,141.631475
Name	ks.16
Coordinates	38.878285,141.636872
Name	ks.17
Coordinates	38.869078,141.641522
Name	ks.18
Coordinates	38.86233,141.654038
Name	ks.19
Coordinates	38.860292,141.648477
Name	ks.20
Coordinates	38.857602,141.64079
Name	ks.21
Coordinates	38.855357,141.63231
Name	ks.22
Coordinates	38.825672,141.603473
Name	ks.23
Coordinates	38.806415,141.608465
Name	ks.24
Coordinates	38.829058,141.61522
Name	ks.25
Coordinates	38.818097,141.623695
Name	ks.26
Coordinates	38.846482,141.660728
Name	ks.27
Coordinates	38.852703,141.65388
Name	op.01
Coordinates	38.573747,141.476147
Name	op.02
Coordinates	38.57857,141.488347
Name	op.03
Coordinates	38.573747,141.488347
Name	op.04
Coordinates	38.565608,141.488347
Name	op.05
Coordinates	38.582605,141.500095
Name	op.06
Coordinates	38.573747,141.500095
Name	op.07
Coordinates	38.564517,141.500095
Name	op.08
Coordinates	38.556198,141.50248
Name	op.09
Coordinates	38.545045,141.500095
Name	op.10
Coordinates	38.591597,141.516667
Name	op.11
Coordinates	38.582605,141.516667
Name	op.12
Coordinates	38.573747,141.516667
Name	op.13
Coordinates	38.564618,141.516667
Name	op.14
Coordinates	38.591597,141.533333
Name	op.15
Coordinates	38.582605,141.533333
Name	op.16
Coordinates	38.573747,141.533333
Name	op.17
Coordinates	38.564823,141.533333
Name	op.18
Coordinates	38.556198,141.533333
Name	ng.c1
Coordinates	38.55522,141.46272
Name	ng.c2
Coordinates	38.55333,141.46161
Name	ng.c3
Coordinates	38.55331,141.46453
Name	ng.c4
Coordinates	38.55151,141.46739
Name	ng.c5
Coordinates	38.55141,141.46464
Name	ng.d1
Coordinates	38.55143,141.46175
Name	ng.d2
Coordinates	38.55133,141.45858
Name	ng.d3
Coordinates	38.54932,141.45858
Name	ng.e1
Coordinates	38.54953,141.46172
Name	ng.e2
Coordinates	38.54951,141.46466
Name	ng.e3
Coordinates	38.54953,141.46752
Name	ng.00
Coordinates	38.54729,141.46761
Name	ng.02
Coordinates	38.54732,141.46175
Name	ng.03
Coordinates	38.54716,141.45858
Name	ng.04
Coordinates	38.54497,141.45855
Name	ng.05
Coordinates	38.54367,141.45647
Name	ng.06
Coordinates	38.54276,141.45853
Name	ng.07
Coordinates	38.54073,141.4587
Name	ng.08
Coordinates	38.54508,141.46177
Name	ng.09
Coordinates	38.54552,141.46625
Name	ng.10
Coordinates	38.54393,141.46701
Name	ng.11
Coordinates	38.56292,141.4581
Name	ng.12
Coordinates	38.55958,141.45716
Name	ng.13
Coordinates	38.56011,141.45773
Name	ng.14
Coordinates	38.56054,141.45824
Name	ng.15
Coordinates	38.55924,141.45911
Name	ng.16
Coordinates	38.55751,141.46002
Name	ng.17
Coordinates	38.55761,141.4603
Name	ng.17'
Coordinates	38.55773,141.4606
Name	ng.18
Coordinates	38.55562,141.46096
Name	ng.19
Coordinates	38.55618,141.4617
Name	ng.20
Coordinates	38.55674,141.46238
Name	ng.01
Coordinates	38.54724,141.46475

Results and Future Plan

There was a heavy rain in bays of Sanriku coast during the periods from summer to fall 2013, and this rain increased river run-off there. This river run-off during the rainy period drove estuarine circulation and influenced water quality in the bays. Particularly, in Shidugawa Bay, dissolved oxygen in the bottom layer of inner bay was lower than that in 2012. The generation of this lower dissolved oxygen water was closely related to the primary production enhanced by the river run-off. In Onagawa Bay, similar lower dissolved oxygen water was found in the bottom layer of inner bay, and the influences of the rain were confirmed there. This suggests that the generation of this water is also related to the lower trophic ecosystem in Onagawa Bay. In the bays, intrusion of oceanic water was found in winter 2013. Particularly, in Onagawa Bay, there were oceanic water intrusions not only on seasonal timescale but also with periods shorter than 30 days. There is a possibility that nutrient transport from outside to inside of the bay is accompanied by the intrusions with periods shorter than 30 days as well as on seasonal timescale and that this short-term nutrient transport influences both the lower trophic ecosystem and fishery in the bay.

Investigation Item and Data Acquisition

Investigation Item	Data Acquisition
current measurement	current direction and speed
survey of water quality	water temperature, salinity, turbidity, dissolved oxygen, chlorophyll a

Reference

Related Observation Plan

FY2013 Investigation of flow field in bays of Sanriku coast

Related Observation Data

CTD Nagaratsuraura (water quality) 131118-131213
CTD Oppabay (water quality) 20130911-2014020
Buoy Onagawabay01 (water quality) 201312010000-201402080000
CTD Ogatsubay (water quality) 20130829-20140225
CTD Kesennumabay (water quality) 20130821-20140127
Shipboard ADCP Nagatsuraura (current) 20131118-20131213
Buoy Onagawabay02 (water quality) 201304010000-201411010000
Buoy Onagawabay03 (water quality) 201304010000-201512010000
Buoy Shizugawabay (water quality) 201304010000-201511050000
Shipboard ADCP Ogatsu (current) 20130418-20140225
Shipboard ADCP Oppabay (current) 20130911-20140204
Shipboard ADCP Kesennumabay (current) 20130821-20130823
Shipboard ADCP Kesennumabay (current) 20140125-20140127
CTD Onagawabay (water quality) 20130708
CTD Onagawabay (water quality) 20140114
CTD Onagawabay_st00 (water quality) 20130401-20140331
CTD Onagawabay_st01 (water quality) 20130404-20140326
Shipboard ADCP Onagawabay (current) 20130708
Shipboard ADCP Onagawabay (current) 20140114

Person in charge of Investigation

Representative person	Daisuke Takahashi
Organization	Tohoku University
Department	Graduate school of agricultural science

Keywords

Fiscal Year	2013
Organization	Tohoku University
Category	Field survey
Research Area	South Sanriku
Discipline	Ocean physics -> Water temperature Ocean physics -> Salinity Ocean physics -> Ocean current / Tidal current (Current direction/Current speed) Ocean chemistry -> Dissolved oxygen Ocean environment -> Plant pigments Ocean environment -> Others

Investigation of flow field in bays of Sanriku coast

Fiscal Year

Title

Project and Theme

Project 1. Study on ecological succession of fisheries ground

Theme1. Environmental monitoring in coastal sea areas of Miyagi Prefecture

Research Information

Period and Interval

Research Area

Category

Overview

Overview of the Observation

Research Point Table

Results and Future Plan

Investigation Item and Data Acquisition

Reference

Related Observation Plan

Related Observation Data

Person in charge of Investigation

Keywords