Establishment And Application Of An Assessment Index System For Evaluating The Dry And Wet Degree Of Earthen Sites’ Preservation Environment

Earthen monument is a kind of ancient sites that is based on soil as the main building materials with historical, cultural and scientific value. Because the earthen monument is generally located outdoors and has some characteristics such as immovability, large area and poor water stability, the water in its surrounding environment has great influence on it..Therefore,in the protection of earthen monuments, scientific evaluation on the dry and wet degree of earthen sites’ preservation environment directly affects the feasibility and effectiveness of the preventive and protective measures taken.This paper first defines the concept of "environmental humidity", and analyses indexes related to the dry and wet degree of earthen sites’preservation environment from the atmospheric environment, water environment, geological environment, biological environment and soil environment,screens out the final indexes by Delphi method, establishes the index system to discriminate the dry and wet degree of earthen sites’preservation environment, and uses these indexes to divide the dry and wet degree of environment. Finally,taking the Liangzhu site in Hangzhou as an example, judges the dry and wet degree of environment by using the fuzzy comprehensive evaluation method,summarizes its environmental characteristics, analyses its main diseases and their causes, puts forward specific protective measures. The results of this research provide a digital approach for different soil sites in the protection of mutual learning and discrimination. The main contents and preliminary conclusions are as follows:(1) This paper redefines the meaning of environmental humidity, and makes a comprehensive analys is of the factors affecting the environment humidity of the soil site.(2) According to the environmental factors on soil sites,we establish the index system to discriminate the dry and wet degree of environment by Delphi method with relative humidity, precipitation, aridity (or wet coefficient), water area, forest coverage rate and water content of soil as quantitative indexes and vegetation type as the qualitative index. (3)The environment which the earthen monument is in is made divided into arid, semi-arid region, transition region, the humid region and wet region, and each index is defined the range of the district.(4) Taking the Liangzhu site in Hangzhou as an example, this paper discriminates that the Hangzhou Liangzhu site belongs to the humid area by using fuzzy comprehensive evaluation method.According to the index system, we summarize its environmental characteristics, analyse its main diseases and their causes,and discuss the protective measures.