靖边油区洛河组与安定组富水性研究

在靖边油区油井施工中,白垩系下统洛河组砂岩底部泥浆漏失概率42%～66%,而砂岩其它部位未出现漏水现象。侏罗系中统安定组与上覆洛河组呈角度不整合接触,古风化壳的存在使安定组顶部灰岩裂隙十分发育,最大漏失量达0.88m3/mm。故洛河组砂岩底部与安定组泥灰岩是靖边油区开发地下水的较佳部位。     

瓜尔豆产量形成的农业气象指标研究

通过2000年和2001年的试验研究，证明我区气候是适宜瓜尔豆生长的，并进一步研究出瓜尔豆正常生长所需的气象指标。     

大豆不同种植方式的比较

对大豆的5种密植方式的生育状况及产量进行分析，结果表明：在相同密度下，宽台密植的3种处理比其它处理方法叶面积指数和干物质积累和光照强度有明显的增加，改善了大豆冠层中、下部的透光性能，提高了大豆产量。建议宽台密植可在三江平原大面积推广使用。     

Material component to non-linear relation between sediment yield and drainage network development:an flume experimental study

1 IntroductionThe drainage network is one of the important components in a fluvial system, as Schumm[1] pointed out that three zones compose a typical fluvial system. As early as in the mid 20th century, Horton[2] made a significant quantitative explanation to hydro-geomorphology in a drainage network system. Since the 1960s, Leopold and Langbein have studied the network structure with random walk and entropy, and Shreve, Smart and Scheideger have topologically studied network structure[3-1…     

岳西县改造中低产田初步尝试

岳西是典型的贫困山区县,由于低产土壤分布广,自然灾害频繁,物化投入少等原因导致粮食生产水平低,广大群众没有摆脱贫困。通过耕作制度改革,优化种植结构等措施,已取得显著效果。对于山区低温冷害类型和生理机制等方面研究,也取得较大进展,同时也闯出一条具有山区特色发展高效农业的路子。     

Wind-determined sediment distribution and Holocene sediment yield in a small,Danish, kettle lake

Sediment distribution was mapped by multiple corings in a small oligotrophic lake in northwestern Denmark. Sediment cores along a representative West-East transect were dated by ¹⁴C and correlated using pollen, mineral magnetics and general lithology. Estimates of whole-lake Holocene sediment accumulation were used to calculate sediment yield (terrestrial erosion). Results indicate that: 1) sediment yield was low 10000–5000 BP and increased strongly 5000–2500 BP and again 2500–1200 BP, 2) sediment focusing and waves and currents induced by strong winds were the major processes controlling sediment distribution throughout the Holocene; 3) the dominant wind direction of strong winds has been westerly throughout the Holocene; and 4) the lake was probably more productive in the last 5000 years than in the period from 10000 to 5000 BP.     

几种屈服函数的比较

应用等向压缩试验和三轴剪切试验2种参数测定方法和5种屈服函数计算了单向压缩、单剪和软土地基固结变形3个算例。计算结果表明,计算参数定义方法影响最大,屈服函数的影响比较次要,而且在π平面上选用较复杂的函数未必比简单的圆形函数更好。     

Sediment yield and delivery in the blanket peat moorlands of the southern Pennines

In contrast to much previous research on blanket peat moorland, which has concentrated upon studies of the form and causes of gully erosion, this paper attempts to investigate sediment transport and to estimate both short-term and long-term sediment yields in such terrain. The research was conducted on Wessenden Head Moor to the west of Huddersfield, Yorkshire, where automatic stream sampling continued over a period of two years. Use of corrected rating curves (Ferguson, 1988) provided a mean estimate of sediment yield over this period of 55 t km^?2 yr^?1. In addition an estimate of longer-term sediment yield was derived from four reservoir sediment surveys in the Wessenden Valley. Total yield was 203.69 t km^?2 yr^?1, including an organic fraction of 38.82 t km ^?2 yr^?1. Stream sampling at three sites on Shiny Brook, including headwaters and the outflow to the reservoir, suggested that there is great temporal and spatial variability in mineral and organic inputs to the reservoirs. Although not excessive in gravimetric terms, the low density of peat means that there is a serious erosion problem. Estimates of erosion rates for the peat gully network at Shiny Brook appear to confirm earlier evidence concerning the relatively recent occurrence of this erosion, within the last two centuries.     

EFFECT OF FINE PARTICLES ON THE VERTICAL CONCENTRATION DISTRIBUTION AND TRANSPORT RATE OF COARSE PARTICLES

ＥＦＦＥＣＴＯＦＦＩＮＥＰＡＲＴＩＣＬＥＳＯＮＴＨＥＶＥＲＴＩＣＡＬＣＯＮＣＥＮＴＲＡＴＩＯＮＤＩＳＴＲＩＢＵＴＩＯＮＡＮＤＴＲＡＮＳＰＯＲＴＲＡＴＥＯＦＣＯＡＲＳＥＰＡＲＴＩＣＬＥＳＷＡＮＺｈａｏｈｕｉ；ＳＯＮＧＴｉａｎｃｈｅｎｇＡｂｓｔｒａｃｔ：...     

常用流域水文模型若干问题探讨

简要介绍了三个国内常用的水文模型,探讨了这三个模型中的蒸发、下渗、产汇流机制,并剖析了模型中存在的问题.