The distribution and morphometry of lakes and reservoirs in British Columbia: a provincial inventory

An inventory of provincial lakes and reservoirs has been developed to characterise and assess the distribution and morphometry of standing water bodies in British Columbia. In the province, there are over 241,500 lakes and reservoirs greater than 1,000 m ² in size. These water bodies cover 2.37 percent of the province area and contain an estimated 521 km ³ of water (312 km ³ in natural lakes and 209 km ³ in reservoirs). A hypsometric relation suitable for order-of-magnitude estimates of lake volume from lake area is presented. Based on the distribution and morphometric attributes of lakes, several distinctive limnologic regions were identified, including the northeastern Alberta Plateau (highest proportion of circular lakes), the southwestern Alberta Plateau (lowest lake density/coverage and highest proportion of irregularly shaped lakes) and the Milbanke Strandflat (highest density of lakes). Observed regional and scale-related patterns in lake distribution/morphometry appear to be largely related to geomorphic controls, particularly tectonic and glacial history. Large-scale hydrologic implications of these standing water bodies and potential ecosystem/water resource management applications of the provincial inventory are also discussed.     

Constructing national identity in Canada's capital, 1900–2000: Confederation Square and the National War Memorial

Ottawa's Confederation Square was initially planned to be a civic plaza to balance the nearby federal presence of Parliament Hill. A century of federal planning, with the direct involvement of Prime Minister W.L. Mackenzie King, repositioned it as a national space in the City Beautiful style. Recent renovations have improved its pedestrian amenity and restored much of the original plan by French urban designer Jacques Gréber. The square contains the National War Memorial and the National Arts Centre, yet is a weak public space due to weak edge definition, animation, and spatial enclosure. The war memorial design was selected in a 1925 international competition won by Britain's Vernon March. The Great War monument was not installed until the 1939 Royal visit, and Mackenzie King intended that the re-planning of the capital would be the World War II memorial. However, the symbolic meaning of the Great War monument gradually expanded to become the place of remembrance for all Canadian war sacrifices. The National War Memorial is more successful as a symbolic object than Confederation Square is as a public space, yet both have evolved into important elements of the Canadian capital's national identity.     

从砍斫器到石斧：再修锐技术的演进

狩猎采集群的重要压力在于石料的采办。当石制品系统中一个部分的变化抬高采办成本并超过可接受限制时,系统中就必然出现其它方面的补偿性变化。在本文中,系统的两个最易变的部分包括：（1）被处理原料的数量;（2）由再修锐技术决定的工具使用寿命。主要由于随时间增加的切割需求,也因为木器、狩猎和筑房技术的进步,再修锐方式从硬锤打击,转向软锤打击、石片再修锐、压制法再修锐,最终转向刃缘磨光。该模式指出,     

The charophyte Lamprothamnium succinctum as an environmental indicator: a Holocene example from Tom Thumbs Lagoon,eastern Australia

The palaeobiota from a middle to late Holocene succession in Tom Thumbs Lagoon, N.S.W., Australia, reflects a range of environmental conditions caused by sea-level changes and active estuarine sedimentation. At the base of the succession (～ ?0.4 m AHD) a thin bed, containing molluscs dated at 6.7 ka B.P. by radiocarbon and amino acid racemisation, and foraminifers is indicative of open estuarine conditions. From +0.35 m AHD towards the top of the sequence the charophyte Lamprothamnium succinctum occurs in subrecent deposits. This species is characterised here by statistical measurements, and new characters are described and illustrated. The charophytes record a drop in sea level and the establishment of a lower salinity artificial wetland. The investigation has also established that decalcification in charophytes can be related to acidification produced by the release of organic acids, aggravated after 1928 by anthropogenic pollution.