...I would have thought such rapid terminal advancement as this would be evidence of the Glacier melting...moving rapidly over meltwater.
You may be right. The science may mean this glacier is in fact melting and suffering from global warming. And the glaciers that are retreating? The science may mean that those glaciers are the ones suffering from global warming. The real problem is that today's "scientists" are like todays journalists, too lazy to support their default conclusions:
Hurricane in Louisiana? Bush's fault.
Increase or decrease in rainfall, snowfall, temperature? Global warming.
I'd like to see real analysis, but it's not going to come from the current generation of professionals in those fields. Your explanation could be true, as could a softening of the glacier's core that changes the viscosity or whatever they call the glacial equivalent, but scientists are supposed to need evidence, and they no longer bother.
Look under Reports (http://www.glacierresearch.com/) at the slide presentation titled:
Monitoring Tidewater Terminus Dynamics Using Laser Ranging and Fixed Photography: Hubbard Glacier, Southeast Alaska
It definitely refers to ice accumulation in the glacier. It is not global warming that is causing the glacier to flow faster. It is ice accumulation.
I would think so too. However if that is the case, I don't think the external ambient temperature would cause the internal base of the glacier where it contacts land to melt thus causing the glacier to "slide". Any such temperature would cause the external surface of the glacier to melt causing it to shrink.
My guess is that there is something going on underneath the glacier, such as increased volcanic activity that is causing a warming in the earth underneath the clacier.
“...I would have thought such rapid terminal advancement as this would be evidence of the Glacier melting...moving rapidly over meltwater.”
A larger glacier forming behind it is pushing it!
No glacier is stationary, they all continually move.