摘要：利用黄河中游河龙间5条入黄一级支流水文站自有观测纪录以来至2010年日径流资料,采用逐日平均流量过程线进行了基流切割,研究了五支流基流变化趋势。结果表明,五支流基流和地表径流均呈减少趋势,呈现出1980年前、1981~1998年、1999~2010年三个相对平稳的时段,第一时段和第三时段基流减少与径流减少的比值从高到低依次为：秃尾河57.8%、佳芦河37.2%、窟野河32.0%、孤山川20.3%、皇甫川15.2%,由北向南、由东向西,在河川径流减少量中,地下水补给减少的比重升高。在此基础上探讨了地形地貌、地质构造、气象水文和人类活动等因素对河川基流的影响,认为区域生产建设用水和地下水开采等人为因素是区域河川基流趋势性变化的主要控制因素。

摘要：[目的]为了加强水土流失严重区,生态脆弱地区,水土流失重点预防和重点治理区,崩塌、滑坡危险区和泥石流易发区等特定区域生产建设项目水土保持的分类管理。[方法]通过对特定区域的水土流失特点及水土流失防治对策,结合有关水土保持法法律、法规和技术标准等拟定水土保持的分类管理要求。[结果]提出了特定区域生产建设项目水土流失防治技术要求。主要包括:提高水土流失防治标准和水土保持工程等级,严格控制地表扰动范围,最大限度减轻对区域水土流失影响等。[结论]不同区域生产建设项目水土流失防治应该执行特定的防治标准等级、防治工程设计标准等级和水土保持措施综合配置及相应的技术要求。

摘要：Under the influence of the natural and human factors, water table of irri- gated area Changes frequently, but it is mainly affected by irrigation water infiltration replenishment during the irrigation. 5 groundwater observation wells were constructed in experimental plot of the Daxia irrigated area to carry out the experiment of the effect of irrigation on groundwater dynamic change in this research. The results showed that the groundwater stage dynarnic change rule of spring and seedling irri- gation stage in the typical plot was fit to the hydrological geology condition of grade- I terrace of Huangshui river valley. On the whole, lateral canal water direction formed a line effect. The No. 1 and No. 2 observation well were the closest to the lateral canal, which received more supplies, and the water level was the highest; the No, 3 observation well took the second place; The No. 4 and No. 5 observation well accepted least supplies, and the water level was the lowest. The rangeability of water table of spring irrigation period was significantly higher than that of seedling irrigation period, this is mainly due to the difference value of intake water volume and drainage water volume of spring irrigation phase was significantly higher than the seedling irrigation phase.

摘要：以西气东输工程为例,根据项目主体可行性研究的要求,论证了绿化土地的分布和面积,分析了绿化地的立地条件,提出了绿化植物种选择方案和总体布局案,并根据项目对绿化的特殊要求,通过对绿化方案的比选,最后提出可行的绿化方案和典型地段的绿化工程方案。系统地介绍了可行性研究阶段水土保持方案中绿化工程设计的要求及内容。