静乐井水位前驱波重现性问题探讨

以山西静乐井为研究对象,对井水位前驱波重现性问题进行了探讨。结果表明,相似地震前前驱波起始时间和波动周期在一定范围内具有较强的重现性,其比例可达63.1%;部分相似地震前前驱波的波动形态和幅度也存在一定的相似性,但在研究范围内前驱波各项特征均相似的地震尚未发现,其原因可能与前驱波的成因、传播途径、相似地震的震源区特征等因素有关。     

静乐井水位前驱重现性问题探讨

以山西静乐井为研究对象,对井水位前驱波重现性问题进行了探讨。结果表明,相似地震前前驱波起始时间和波动周期在一定范围内具有较强的重现性,其比例可达63.1%;部分相似地震前前驱波波动形态和波动幅度也存在一定的相似性,但在研究范围内前驱波各项特征均相似的地震尚未发现,其原因可能与前驱波的成因、传播途径、相似地震的震源区特征等因素有关。     

Elevation models for reproducible evaluation of terrain representation

ABSTRACT

This paper proposes elevation models to promote, evaluate, and compare various terrain representation techniques. Our goal is to increase the reproducibility of terrain rendering algorithms and techniques across different scales and landscapes. We introduce elevation models of varying terrain types, available to the user at no cost, with minimal common data imperfections such as missing data values, resampling artifacts, and seams. Three multiscale elevation models are available, each consisting of a set of elevation grids, centered on the same geographic location, with increasing cell sizes and spatial extents. We also propose a collection of single-scale elevation models of archetypal landforms including folded ridges, a braided riverbed, active and stabilized sand dunes, and a volcanic caldera. An inventory of 78 publications with a total of 155 renderings illustrating terrain visualization techniques guided the selection of landform types in the elevation models. The benefits of using the proposed elevation models include straightforward comparison of terrain representation methods across different publications and better documentation of the source data, which increases the reproducibility of terrain representations.     

水资源的天然可再生能力及其与更新速率之间的关系

阐述了水资源的可再生性及天然可再生能力的表示方法，探讨了水资源天然可再生能力与水资源更新速率之间的关系。研究结果显示用单位时间的可更新水资源量来表述水资源天然可再生能力具有突出的优点。研究同时表明水资源更新速率与可更新水资源量之间关系密切，如果获得了水资源更新速率，则较易获得其可更新水资源流量，从而可以研究水资源的可再生性。以全国水资源－级分区及黄河流域二级分区为例评价了其水资源的天然可再生能力。