| 1. | 16 17 . 4 . dredging channels in
4 .基围7疏道工程 |
| 2. | The effect of dredging channel for deposition reduction is related to dredged channel geometry morphology and dredged channel area
挖河减淤效果与挖槽几何形态及挖槽面积有关。 |
| 3. | In this paper , the method combined the “ s ” shape sediment control dam with the dredged channel has been put forward
为此，在比较各种疏浚方案效果的情况下，提出了挖泥槽与增设折线型防淤堤相结合的清淤疏浚措施。 |
| 4. | Under the condition of testing discharge - sediment and dredging sediment quantity of 3380000m3 , when dredging channel length is about 10km , the effect of dredging channel for deposition reduction will be rather better
在试验水沙条件及挖沙量338万m ’条件下，挖河氏度在10km左右时，挖河的减淤效果较佳。 |
| 5. | The bulk of effect on dredging river for deposition reduction is relative to chosen datum of dredging channel geometry parameter . geometry parameters include dredging channel length , morphology of transversal section and longitudinal slopes
挖河减淤效果的大小与挖槽几何参数的选值有关，几何参数包括挖河长度、断面形态及挖槽比降等。 |
| 6. | In order to reduce the re - deposit volume of the dredged channel , the method must be based on decreasing the oncoming sediment , changing the mouth site , builting the sediment control dam and raising the reservoir level
为了最大限度地减小疏浚挖槽的回淤量，必须依靠控制上游来沙量、调整入水口门位置、加设防淤堤及提高库水位等手段，而不能通过调整挖泥槽宽度、位置及数量等措施来达到目的。 |
| 7. | 3 . the drop datum of largest water level in researched reaches increases relatively with length increase of dredging channel in definite condition of discharge and sediment and definite dredged sediment quantity or dredged morphology of transversal section
在一定的水沙条件和一定的挖沙量或一定挖河断面条件下，随挖河长度增加，研究西安理工大学工程硕士学位论文河段最大水位降落值相对越大。 |
| 8. | For recent years , in view of the effects of deposition reduction of river dredging and key technology in the lower yellow - river , a series of key tasks on special topics have been carried out by many researchers . and a series of research results have been obtained . this paper will combine with research results mentioned above to analyze as well as emphasizal analyze results by means of physics model " test , and demonstrate the effect of dredging channel " geometry parameter on deposition reduction of river dredging and mechanism of deposition reduction of river dredging
为此，近年来，许多研究人员针对黄河下游挖河的减淤作用及其关键技术开展了一系列专题攻关，进行系统研究及分析论证，并取得一系列研究成果，本论文结合此课题，重点通过物理模型试验对挖河几何参数对挖河减淤效果的影响以及挖河减淤机理方面进行重点分析论证。 |
| 9. | But when the dredged length have increased to a certain value , the increment of water level drop datum decreased continuously with length increase of dredging channel . in other word , unit length increment tends to slowly . when dredging channel length is in a certain datum region , the effect of dredging sediment for deposition reduction is better relatively
但是，当长度增加到一定值以后，随挖河长度的增加，水位跌落值增量不断减小，即单位长度的增加量逐渐趋缓；当挖河长度取于某一值域内时，挖河的减淤效果才相对较佳。 |
| 10. | By analyzing on nature , society and economy conditions as well as distribution characteristics of sand source in the lower lhasa river valley , put forward a series of comprehensive renovation scheme to harness sand sources , mainly including dredging channel , planting farmland shelter - forest network , constructing arbor - bush - herb shelter forest and shifting sand stabilization , this scheme will not only control blown - sand threat , and improve local ecological environment ; at the same time , also lay the strong foundation for enlarging lhasa city space and effectively utilizing local resource , embody a sustainable thought on how to make comprehensive renovation in high cold valley region
摘要在深入分析本区自然社会经济条件和风沙源分布特征基础上，提出把拉萨河下游河道疏浚与风沙源治理相结合，以河道疏浚、农田防护林、乔灌草防风护沙林和流沙固定等物理工程、生物和机械措施为主体，进行风沙源综合整治，一方面可有效控制风沙灾害的威胁，改善河谷区生态环境，同时为拉萨市城市空间发展和当地资源的有效利用奠定了基础，体现了在高寒河谷区进行风沙源综合整治的可持续性思路。 |
