Forest fires seriously threaten forestry resources and the life and property safety of people in mountainous areas of Lishui City. In this paper, a fire prevention concept with refined forecast and early warning of fo...Forest fires seriously threaten forestry resources and the life and property safety of people in mountainous areas of Lishui City. In this paper, a fire prevention concept with refined forecast and early warning of forest fire danger weather ratings in townships as the starting point, satellite real-time observation of fire spots, monitoring of the Internet of Things and other high-tech products as an implementation means, and strengthening forest fire prevention equipment and personnel in townships as a guarantee was established. The command system for rapid emergency response by cities, counties and townships should be improved. During the forest fire prevention period, fire sources should be strictly controlled, and the basic principles of forest fire fighting in townships should be implemented into the actual fire prevention and fire fighting work to eliminate forest fires in time at the initial stage and before the disaster.展开更多
The change and distribution of inorganic phosphate and dissolved oxygen content in sea water pos-sess a certuin regularity and correlation, which are closely related to the direct influence of biologicalactivities. Du...The change and distribution of inorganic phosphate and dissolved oxygen content in sea water pos-sess a certuin regularity and correlation, which are closely related to the direct influence of biologicalactivities. During the period of phytoplankton bloom, phosphate content may be exhausted and, at thesame time, oxygen content in sea water increases in the euphotic layer. With the decomposition of or-ganic matter, phosphate content increases and oxygen content decreases in the deeper layer. In addi-tion, the upwelling carries the "new" nutrients to the euphotic layer, which provides advantageous展开更多
On the basis of previous studies and by means of field geological, remote sensing, petrographical,mineralogical, petrochemical and geochemical investigations, the authors studied the temporal-spatial distribu-tion of ...On the basis of previous studies and by means of field geological, remote sensing, petrographical,mineralogical, petrochemical and geochemical investigations, the authors studied the temporal-spatial distribu-tion of the regional structures, volcanic structures and products of volcanic activity in the coastal area ofsoutheastern Zhejiang. On the basis and through a systematic comparison of the products of magmatism in thearea, it is considered that there exists a compsite volcanic structural belt composed of linear and circular struc-tures and it has been demonstrated that there exist volcanic intrusive complexes--'trinity' composed of vol-canic, subvolcanic and plutonic rocks. It is suggested that the volcanic intrusive complexes in the area belong tothe typical syntexis series and that its materials were derived from a mixed source of crust and mantle.展开更多
With the constant increase of farmers' incomes, the declining ratio of low-income farmers and the development of rural economy in the mountainous areas of Zhejiang Province, the farmers gain much more transfer inc...With the constant increase of farmers' incomes, the declining ratio of low-income farmers and the development of rural economy in the mountainous areas of Zhejiang Province, the farmers gain much more transfer income from the secondary allocation and their lives were greatly improved. But due to the uneven economic development, the agricultural development level of different land forms differs greatly and there is still a large gap between the incomes of urban and rural residents. In this paper, through an in-depth analysis of the farmers' income, agricultural industrial structure and urban-rural income gap in different mountainous areas of Zhejiang Province, some advices were proposed to increase the farmers' incomes.展开更多
将Holland风场与ERA5风场相结合,通过引入一个随风速半径变化的权重系数,构建了混合风场,进而利用MIKE21 SW建立了浙江海域台风浪模型。使用Holland风场、ERA5风场、混合风场作为输入风场模拟1918号台风“米娜”期间的风速和有效波高,...将Holland风场与ERA5风场相结合,通过引入一个随风速半径变化的权重系数,构建了混合风场,进而利用MIKE21 SW建立了浙江海域台风浪模型。使用Holland风场、ERA5风场、混合风场作为输入风场模拟1918号台风“米娜”期间的风速和有效波高,验证结果说明Holland风场和ERA5风场均无法准确反映真实风场和有效波高,而本文构建的混合风场弥补了两种风场的不足。为验证混合风场在浙江海域是否具有普适性,选取近5年影响浙江海域最为严重的5个典型台风进行台风浪数值模拟实验,并开展误差统计分析。结果表明:Holland风场在台风中心周围的风速模拟表现较好,最大风速的平均相对误差为8.62%~10.19%,但10 m s以下风速的平均相对误差较大,为29.76%~44.29%;ERA5风场在台风中心周围的风速偏小,最大风速的平均相对误差为17.64%~25.77%,但10 m s以下风速的平均相对误差比Holland风场小,为19.64%~32.00%。对5个台风的模拟中,由Holland风场、ERA5风场和混合风场驱动得到的台风浪有效波高平均相对误差的平均值分别为29.92%、25.62%和22.82%,均方根误差的平均值分别为0.46 m、0.42 m和0.39 m,一致性指数分别为0.94、0.95和0.96。上述结果说明本文构建的混合风场在浙江海域具有普适性,能够提高台风浪的模拟准确度。展开更多
基金Supported by the Science and Technology Project of Jingning County(2022C7).
文摘Forest fires seriously threaten forestry resources and the life and property safety of people in mountainous areas of Lishui City. In this paper, a fire prevention concept with refined forecast and early warning of forest fire danger weather ratings in townships as the starting point, satellite real-time observation of fire spots, monitoring of the Internet of Things and other high-tech products as an implementation means, and strengthening forest fire prevention equipment and personnel in townships as a guarantee was established. The command system for rapid emergency response by cities, counties and townships should be improved. During the forest fire prevention period, fire sources should be strictly controlled, and the basic principles of forest fire fighting in townships should be implemented into the actual fire prevention and fire fighting work to eliminate forest fires in time at the initial stage and before the disaster.
文摘The change and distribution of inorganic phosphate and dissolved oxygen content in sea water pos-sess a certuin regularity and correlation, which are closely related to the direct influence of biologicalactivities. During the period of phytoplankton bloom, phosphate content may be exhausted and, at thesame time, oxygen content in sea water increases in the euphotic layer. With the decomposition of or-ganic matter, phosphate content increases and oxygen content decreases in the deeper layer. In addi-tion, the upwelling carries the "new" nutrients to the euphotic layer, which provides advantageous
文摘On the basis of previous studies and by means of field geological, remote sensing, petrographical,mineralogical, petrochemical and geochemical investigations, the authors studied the temporal-spatial distribu-tion of the regional structures, volcanic structures and products of volcanic activity in the coastal area ofsoutheastern Zhejiang. On the basis and through a systematic comparison of the products of magmatism in thearea, it is considered that there exists a compsite volcanic structural belt composed of linear and circular struc-tures and it has been demonstrated that there exist volcanic intrusive complexes--'trinity' composed of vol-canic, subvolcanic and plutonic rocks. It is suggested that the volcanic intrusive complexes in the area belong tothe typical syntexis series and that its materials were derived from a mixed source of crust and mantle.
基金Supported by the Project of the Scientific and Technical Measures to Increase the Farmers' Incomes in Mountainous Areas" of the Science and Technology Department of Zhejiang Province (No.2010C35038)
文摘With the constant increase of farmers' incomes, the declining ratio of low-income farmers and the development of rural economy in the mountainous areas of Zhejiang Province, the farmers gain much more transfer income from the secondary allocation and their lives were greatly improved. But due to the uneven economic development, the agricultural development level of different land forms differs greatly and there is still a large gap between the incomes of urban and rural residents. In this paper, through an in-depth analysis of the farmers' income, agricultural industrial structure and urban-rural income gap in different mountainous areas of Zhejiang Province, some advices were proposed to increase the farmers' incomes.
文摘将Holland风场与ERA5风场相结合,通过引入一个随风速半径变化的权重系数,构建了混合风场,进而利用MIKE21 SW建立了浙江海域台风浪模型。使用Holland风场、ERA5风场、混合风场作为输入风场模拟1918号台风“米娜”期间的风速和有效波高,验证结果说明Holland风场和ERA5风场均无法准确反映真实风场和有效波高,而本文构建的混合风场弥补了两种风场的不足。为验证混合风场在浙江海域是否具有普适性,选取近5年影响浙江海域最为严重的5个典型台风进行台风浪数值模拟实验,并开展误差统计分析。结果表明:Holland风场在台风中心周围的风速模拟表现较好,最大风速的平均相对误差为8.62%~10.19%,但10 m s以下风速的平均相对误差较大,为29.76%~44.29%;ERA5风场在台风中心周围的风速偏小,最大风速的平均相对误差为17.64%~25.77%,但10 m s以下风速的平均相对误差比Holland风场小,为19.64%~32.00%。对5个台风的模拟中,由Holland风场、ERA5风场和混合风场驱动得到的台风浪有效波高平均相对误差的平均值分别为29.92%、25.62%和22.82%,均方根误差的平均值分别为0.46 m、0.42 m和0.39 m,一致性指数分别为0.94、0.95和0.96。上述结果说明本文构建的混合风场在浙江海域具有普适性,能够提高台风浪的模拟准确度。
