The Interplay between a Mountainous River and Nearby Submarine Canyon in Southern Taiwans
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Transcript of The Interplay between a Mountainous River and Nearby Submarine Canyon in Southern Taiwans
The Interplay between a Mountainous River and NThe Interplay between a Mountainous River and Nearby Submarine Canyon in Southern Taiwans earby Submarine Canyon in Southern Taiwans
Ray T. Hsu and James T. Liu
Institute of Marine Geology and Chemistry, National Sun Yat-sen University, Kaohsiung, Taiwan 804-24
Mediterranean seaMediterranean seaHudson Submarine CanyonHudson Submarine Canyon
Submarine Canyons are Everywhere on This Submarine Canyons are Everywhere on This Planet!Planet!
Kaikoura CanyonKaikoura Canyon
Monterey Monterey Submarine Submarine
CanyonCanyonLa Jolla Submarine CanyonLa Jolla Submarine Canyon
Submarine Canyons Around TaiwanSubmarine Canyons Around Taiwan
Kaoping Kaoping Submarine Submarine
CanyonCanyon
South China SeaSouth China Sea
Taiwan StraitTaiwan Strait TaiwanTaiwan
Pacific Pacific OceanOcean
Study Area
Study Area
Drainage area: 3,275 kmDrainage area: 3,275 km22
Mean annual runoff: 8.46*10Mean annual runoff: 8.46*1099 m m33
Annual sediment discharge: 3.61*10Annual sediment discharge: 3.61*1077 M.T. M.T.
The Annual Mean Runoff of The Kaoping RiverThe Annual Mean Runoff of The Kaoping River
78%
Field SurveyField Survey
-30
-30-40
-50
450
-300
2468000
2470000
2472000
2474000
2476000
2478000
2480000
2482000
2484000
2486000
2488000
2490000
168000 170000 172000 174000 176000 178000 180000 182000 184000 186000 188000 190000 192000 194000 196000 198000 200000 202000 204000
Kao-ping River
TaiwanStrait
Lin-pienRiver
Tung-kangRiver
Ta-ponBay
Easting (m)
Tripod
Legend
Hsiao Liu ChiuIsland
Sediment Trap
June 19 – July 20, 2000June 19 – July 20, 2000
Trap Array and TripodTrap Array and TripodTripodTripod
ResultResult
Observations on The TripodObservations on The Tripod
Suspended Sediments Captured in Traps Suspended Sediments Captured in Traps and SSC Measured from LISST-100)and SSC Measured from LISST-100)
10
12
14
16
18
20
22
-80
-60
-40
-20
0
20
40
60
80
10
12
14
16
18
20
22
-80
-60
-40
-20
0
20
40
60
80
Time
TemperatureN-S Current
195 m
24 5 m
Observation on RCMObservation on RCM
Temperature (Tripod and Trap Array)Temperature (Tripod and Trap Array)
DiscussionDiscussion
Coastal impact by kai-tek typhoon.The sand fraction in the suspended sedimen
t concentration (SSC) in the canyon came from the shelf floor above and has the highest correlation with the river sediment discharge.
Clay composes the largest fraction of SSC in the canyon.
Coastal Impact by Kai-tek TyphoonCoastal Impact by Kai-tek Typhoon
SSC and Wave Field at Kaoping
River Mouth
Sand in The Submarine CanyonSand in The Submarine Canyon
Sand Fall in San Lucas Submarine Canyon
Grain Size Composition of Captured SedimentsGrain Size Composition of Captured Sediments
Conclusion (1)Conclusion (1)High mountainous rivers located in the tropical and
subtropical regions of the world whose runoff and sediment content (sediment load) display:
Distinct dry and flood seasons in their annual hydrological cycle
The range of magnitude can span several orders of magnitude
the extreme values in the runoff and sediment content are controlled by episodic events that mostly occur in the summer (flood season)
Conclusion (2)Conclusion (2)
The largest fraction in SSC in Kaoping Submarine Canyon (KPCY) is from clay to very fine grains.
The role of the KPCY is an important conduit for sediments from the river to the ocean, especially in episodic events, such as typhoons