Bottomfast Ice Mapping and the Measurement of Ice Thickness on Tundra Lakes Using C‐Band Synthetic Aperture Radar Remote Sensing 1

Abstract:  Industrial activity in Canada’s north is increasing, placing demands on the use of water from lakes to build ice roads. Winter water withdrawal from these lakes has the potential to impact overwintering fish. Removal of water from small lakes can decrease oxygen and habitat available to fish. To address this issue, a protocol has been developed by the Department of Fisheries and Oceans outlining water withdrawal thresholds. Bathymetric surveys are the traditional method to determine lake depth, but are costly given the remoteness of northern lakes. This paper investigates the use of satellite C-band synthetic aperture radar (SAR) remote sensing technology as a potential alternative or complement to traditional survey methods. Previous research has shown that a SAR can detect the transition from grounded to floating ice on lakes, or if a lake is completely frozen. Grounded ice has a dark signature while floating ice appears very bright in contrast. Similar results were observed for the datasets acquired in the study area. This suggests that lakes that freeze completely to the bottom can be identified using SAR. Such water bodies would not be viable fish overwintering habitat and can therefore be used as water sources without thresholds necessary. However, attempts to accurately calculate the depth of the ice at the grounded-floating ice boundary using bathymetric profiles acquired in the summer and lake ice thickness measurements from a reference lake near Inuvik proved to be unreliable.

[1]  Claude R. Duguay,et al.  Determining depth and ice thickness of shallow sub-Arctic lakes using space-borne optical and SAR data , 2003 .

[2]  Derek Miller.  The physical and chemical effects of mid-winter pumping of tundra lakes on the North Slope, Alaska , 2005 .

[3]  Martin O. Jeffries,et al.  A Method To Determine Lake Depth and Water Availability on the North Slope of Alaska with Spaceborne Imaging Radar and Numerical Ice Growth Modelling , 1996 .

[4]  M. Gaboury,et al.  Influence of Water Level Drawdown on the Fish Populations of Cross Lake, Manitoba , 1984 .

[5]  W. Pollard,et al.  A first approximation of the volume of ground ice, Richards Island, Pleistocene Mackenzie delta, Northwest Territories, Canada , 1980 .

[6]  P. Sibley,et al.  A Review of Water Level Fluctuations on Aquatic Biota With an Emphasis on Fishes in Ice‐Covered Lakes 1 , 2008 .

[7]  J. Brigham‐Grette,et al.  Analysis of lake ice dynamics and morphology on Lake El'gygytgyn, NE Siberia, using synthetic aperture radar (SAR) and Landsat , 2002 .

[8]  F. Chapin,et al.  Evidence and Implications of Recent Climate Change in Northern Alaska and Other Arctic Regions , 2004 .

[9]  P. Dillon,et al.  Factors Affecting Winter Respiration in Ontario Lakes , 1976 .

[10]  M. Nolan.  An annotated bibliography of research related to the possible long-term impacts of pumping water from tundra ponds for the creation of ice roads , 2005 .

[11]  W. F. Weeks,et al.  Ice processes and growth history on Arctic and sub-Arctic lakes using ERS-1 SAR data , 1995, Polar Record.

[12]  K. Mills,et al.  Effects of Water Withdrawal From Ice‐Covered Lakes on Oxygen, Temperature, and Fish 1 , 2008 .

[13]  C. Duguay,et al.  Ice‐cover variability on shallow lakes at high latitudes: model simulations and observations , 2003 .

[14]  W. F. Weeks,et al.  Interesting Features Of Radar Imagery Of Ice-Covered North Slope Lakes , 1977 .