Monitoring and assessment of monuments of cultural heritage is just a small part of all measures necessary for their protection and preservation. Many of these monuments are built of stone and the binder used to bond ...Monitoring and assessment of monuments of cultural heritage is just a small part of all measures necessary for their protection and preservation. Many of these monuments are built of stone and the binder used to bond the construction blocks after a lengthy period of time loses its properties. The loss of binding material or changes in its properties substantially endangers the stability of the monuments thus constituting a menace not only for the visitors, but also for the conservation work. One of such monuments is the Step Pyramid of Djoser in Egypt. In this pyramid different artificial compositions are used as binder and its application in different areas of the pyramid is uneven and almost undistinguishable. Currently it is only possible to appraise the state of preservation of the mortar as a result of weathering process. This research allows identifying up to six weathering types and their intensities. This typology was developed on several sample areas verifying its validity in situ. Since there is no possibility to carry out direct instrumental measurements or take any samples, the classification developed is just empirical and not general. However, it provides relevant support for the development of conservation plans.展开更多
本文以共和盆地马四剖面古风成砂-古土壤沉积序列为研究对象,利用CM-5分光测色计获得土壤色度参数亮度(L^(*))、红度(a^(*))及黄度(b^(*))值,分析色度参数的变化特征,结合Fe2O3、有机质及利用磁化率重建的温度、降水量指标探讨色度参数...本文以共和盆地马四剖面古风成砂-古土壤沉积序列为研究对象,利用CM-5分光测色计获得土壤色度参数亮度(L^(*))、红度(a^(*))及黄度(b^(*))值,分析色度参数的变化特征,结合Fe2O3、有机质及利用磁化率重建的温度、降水量指标探讨色度参数的古气候意义,重建12 cal ka BP以来共和盆地的气候演变过程。结果表明:(1)色度参数L^(*)、a^(*)、b^(*)均值在剖面中整体表现出古风成砂层高于古土壤层的特征, a^(*)/b^(*)与之相反;(2)色度参数可作为有效的气候代用指标重建古气候,b^(*)及a^(*)/b^(*)对气候转变反应敏感,b^(*)高值指示气候冷干,b^(*)低值指示气候温湿,a^(*)/b^(*)高值代表气候温湿, a^(*)/b^(*)低值代表气候冷干。L^(*)、a^(*)在此区域对气候的响应具有一定的局限性;(3) 12 cal ka BP以来共和盆地马四剖面色度揭示的气候演变可划分为7个阶段,表现出冷干-温湿旋回的变化特征。展开更多
文摘Monitoring and assessment of monuments of cultural heritage is just a small part of all measures necessary for their protection and preservation. Many of these monuments are built of stone and the binder used to bond the construction blocks after a lengthy period of time loses its properties. The loss of binding material or changes in its properties substantially endangers the stability of the monuments thus constituting a menace not only for the visitors, but also for the conservation work. One of such monuments is the Step Pyramid of Djoser in Egypt. In this pyramid different artificial compositions are used as binder and its application in different areas of the pyramid is uneven and almost undistinguishable. Currently it is only possible to appraise the state of preservation of the mortar as a result of weathering process. This research allows identifying up to six weathering types and their intensities. This typology was developed on several sample areas verifying its validity in situ. Since there is no possibility to carry out direct instrumental measurements or take any samples, the classification developed is just empirical and not general. However, it provides relevant support for the development of conservation plans.
文摘本文以共和盆地马四剖面古风成砂-古土壤沉积序列为研究对象,利用CM-5分光测色计获得土壤色度参数亮度(L^(*))、红度(a^(*))及黄度(b^(*))值,分析色度参数的变化特征,结合Fe2O3、有机质及利用磁化率重建的温度、降水量指标探讨色度参数的古气候意义,重建12 cal ka BP以来共和盆地的气候演变过程。结果表明:(1)色度参数L^(*)、a^(*)、b^(*)均值在剖面中整体表现出古风成砂层高于古土壤层的特征, a^(*)/b^(*)与之相反;(2)色度参数可作为有效的气候代用指标重建古气候,b^(*)及a^(*)/b^(*)对气候转变反应敏感,b^(*)高值指示气候冷干,b^(*)低值指示气候温湿,a^(*)/b^(*)高值代表气候温湿, a^(*)/b^(*)低值代表气候冷干。L^(*)、a^(*)在此区域对气候的响应具有一定的局限性;(3) 12 cal ka BP以来共和盆地马四剖面色度揭示的气候演变可划分为7个阶段,表现出冷干-温湿旋回的变化特征。
