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41.
42.
两种虾、贝、藻综合养殖模式的初步比较 总被引:5,自引:0,他引:5
利用太平洋牡蛎(Crassostrea gigas)和孔石莼(Ulva pertusavar)与凡纳滨对虾(Litopenaeus vannamei)以2种方式搭配放养,旨在查明其各自的生态特征及养殖效果。实验中对虾设2个放养密度,分别为17尾/m2和34尾/m2;牡蛎、石莼各设1个放养密度,分别为1 700 g/m2,140 g/m2。实验结果表明,经过50 d的实验,2个密度下对虾的生长均是混养明显快于分养模式(高密度混养与分养对虾体重分别为(7.04±0.19)g,(5.20±0.22)g;低密度混养与分养对虾体重分别为(7.89±0.34)g,(5.66±0.30)g)。总产量也是混养模式稍高于分养模式[高密度混养与分养对虾产量分别为(330.92±8.91)g,(189.47±8.05)g;低密度混养与分养对虾产量分别为(264.97±11.46)g,(135.82±7.27)g]。混养模式水体中的浮游植物的含量高于分室循环水模式中的含量,其它水化学指标间没有明显差异。分养循环水模式下虾室中水体过清、透明度过高,从而导致水中光照强度和光色的变化可能是其中对虾生长较慢的主要原因。 相似文献
43.
Based on Hong‘s theory, previous random models, and a generalized expression suitable for FIT calculation, the interaction between irregular waves and vertical walls is numerically simulated. The results of simulation demonstrate that the wave energy changes with the incidence angle and the distance from the wall. Particularly, the Mach effect and the combined wave spectrum characteristics are analyzed in detail, which are significant in both theory and practice. 相似文献
44.
文中介绍陆地影像图与港口航道图镶嵌的制图工艺,影像图与港口航道图镶嵌后的成图质量评价。简单阐述了作者在绘制该图种过程中的一些体会,以及影像图取代现有港口航道图上陆地地形的可行性。 相似文献
45.
By means of the proposed nonlinear diagnostic dynamic model for the planetary boundary layer (PBL) wind field, an introduction is given to the MOD method for wind prediction. Based on the MOD experiments on the surface wind field over the Northern Pacific Ocean from April to October 1985, it is concluded that the nonlinear diagnostic dynamic model used is better than the linear one. 相似文献
46.
Short-Term Benthic Recolonization after Dredging in the Harbour of Ceuta, North Africa 总被引:2,自引:0,他引:2
Abstract. The benthic recovery after dredging (area: 2625 m2) was studied in a polluted and enclosed area of the harbour of Ceuta, in which the recolonization through the water column (larvae and adult bedload transport) could be limited by the lack of renewal. The benthos was sampled at two sites (control and dredged) using a van Veen grab and adopting a BACI (Before, After, Control, Impacted) approach. Five samplings were conducted after dredging (3, 15, 30, 90, 180 days). The proportion of gravel in the sediment of the dredged site increased after dredging, while the organic matter decreased. The impact on the community was estimated at species level, using both univariate and multivariate analyses. The maximum negative effect on benthic macrofauna was a reduction by 65% for species richness (15 days after dredging) and by 75% for abundance (3 days after dredging). Between 15 and 30 days after dredging, the abundance of some species such as the molluscs Parvicardium exiguum and Retusa obtusa and the polychaete Pseudomalacoceros tridentata increased considerably in the dredged site, while typical ‘opportunistic’ species such as Capitella capitata were disfavoured by the disturbance. For this small‐scale dredging, about 6 months are required for the disturbed area to re‐establish a sediment structure and a macrobenthic community similar to the undisturbed area. Small‐patch dredging operations are proposed in harbour management whenever possible, since they allow a quick re‐adjustment of the initial sediment structure and benthic communities. 相似文献
47.
Gas hydrate disturbance fabrics of southern Hydrate Ridge sediments (ODP Leg 204): Relationship with texture and physical properties 总被引:1,自引:0,他引:1
Elena Piñero Eulàlia Gràcia Francisca Martínez-Ruiz Juan Cruz Larrasoaña Alexis Vizcaino Gemma Ercilla 《Geo-Marine Letters》2007,27(2-4):279-288
Soupy and mousse-like fabrics are disturbance sedimentary features that result from the dissociation of gas hydrate, a process
that releases water. During the core retrieval process, soupy and mousse-like fabrics are produced in the gas hydrate-bearing
sediments due to changes in pressure and temperature conditions. Therefore, the identification of soupy and mousse-like fabrics
can be used as a proxy for the presence of gas hydrate in addition to other evidence, such as pore water freshening or anomalously
cool temperature. We present here grain-size results, mineralogical composition and magnetic susceptibility data of soupy
and mousse-like samples from the southern Hydrate Ridge (Cascadia accretionary complex) acquired during Leg 204 of the Ocean
Drilling Program. In order to study the relationship between sedimentary texture and the presence of gas hydrates, we have
compared these results with the main textural and compositional data available from the same area. Most of the disturbed analyzed
samples from the summit and the western flank of southern Hydrate Ridge show a mean grain size coarser than the average mean
grain size of the hemipelagic samples from the same area. The depositional features of the sediments are not recognised due
to disturbance. However, their granulometric statistical parameters and distribution curves, and magnetic susceptibility logs
indicate that they correspond to a turbidite facies. These results suggest that gas hydrates in the southern Hydrate Ridge
could form preferentially in coarser grain-size layers that could act as conduits feeding gas from below the BSR. Two samples
from the uppermost metres near the seafloor at the summit of the southern Hydrate Ridge show a finer mean grain-size value
than the average of hemipelagic samples. They were located where the highest amount of gas hydrates was detected, suggesting
that in this area the availability of methane gas was high enough to generate gas hydrates, even within low-permeability layers.
The mineralogical composition of the soupy and mousse-like sediments does not show any specific characteristic with respect
to the other samples from the southern Hydrate Ridge. 相似文献
48.
渤、黄、东海夏季环流的三维斜压模型 总被引:10,自引:0,他引:10
基于拉格朗日时均观点描述环流,建立起潮流与准定常流共同占优势系统中的陆浅海环流模型,并诊断计算了夏季渤、黄、东海的三维环流图。模拟结果较好地再现了渤、黄、东海主要流系的特征。对照冬季结果,对渤、黄、东海环流的季节变化做了阐述。从环流垂向分量的分布图上,可发现渐闽近海、长江口外存在较明显的上升流区。另外,对夏季渤、黄、东海的热盐环流和潮致余流分别进行了模拟,发现它们均能在黄海构成一逆时针向的五流系统,这对形成和维持夏季黄海冷水团的存在有重要作用。热盐环流的模拟结果表明,黄海冷水团环流含有“热成流”的成分;通过Lagrange余流的计算发现环绕黄河冷水团的环流还含有“潮成流”的成分。 相似文献
49.
1997~ 1 998年出现了 2 0世纪中最强的一次厄尔尼诺事件。根据长江洪水与厄尔尼诺事件的实测资料 ,指出 1 998年的长江巨洪与这次厄尔尼诺事件具有较密切的关系。同时讨论了厄尔尼诺事件影响长江洪水的物理途径 ,这对长江巨洪的长期及超长期预报具有较重要的指示作用 相似文献
50.
A novel method for prediction of the load carrying capacity of a corroded reinforced concrete beam (CRCB) is presented in the paper. Nine reinforced concrete beams, which had been working in an aggressive environment for more than 10 years, were tested in the laboratory. Comprehensive tests, including flexural test, strength test for corroded concrete and rusty rebar, and pullout test for bond strength between concrete and rebar, were condueted. The flexural test results of CRCBs reveal that the distribution of surface cracks on the beams shows a fractal behavior. The relationship between the fractal dimensions and mechanical properties of CRCBs is then studied. A prediction model based on artificial neural network (ANN) is established by the use of the fractal dimension as the corrosion index, together with the basic intbrmation of the beam. The validity of the prediction model is demonstrated through the experimental data, and satisfactory resuits are achieved. 相似文献